When you have the Windows Bluetooth pane open and it is searching for devices then slide the power control on the keyboard to Off and then On shortly after. This should make the keyboard discoverable by Windows.

Make sure that the keyboard is not plugged in via cable to another computer, and make sure that it is not able to communicate with a previously paired Mac at the same time.

Note that the comments you have received earlier regarding duplicates and directions concerns a completely different keyboard, namely the "Apple Wireless Keyboard". You have the "Apple Magic Keyboard" which works in a slightly different manner regarding Bluetooth pairing - and it doesn't have a power button, but rather a slider.

Answer from jksoegaard on Stack Exchange
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Apple Support
support.apple.com › guide › iphone › pair-magic-keyboard-iph4288319c0 › ios
Pair Magic Keyboard with iPhone - Apple Support
Magic Keyboard connects to iPhone using Bluetooth®. Make sure the keyboard is turned on and charged. On iPhone, go to Settings > Bluetooth, then turn on Bluetooth. Select the device when it appears in the Other Devices list. Note: If Magic Keyboard is already paired ...
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Apple Community
discussions.apple.com › thread › 254887970
turn on numeric pad on magic keyboard - Apple Community
September 23, 2023 - If your keyboard has a separate keypad but no Num Lock key, try pressing Shift-Delete. If the numeric keypad still doesn’t work as you expect, you may have enabled Mouse Keys, which lets you move the pointer with the keypad. To turn Mouse Keys off, choose Apple menu > System Settings, click Accessibility in the sidebar, click Pointer Control on the right (you may need to scroll down), then turn Mouse Keys off. ... Magic Keyboard Numeric Keypad not working I just bought this keyboard and I can't figure out how to get the numeric keypad to work because it doesn't have a numbers lock button on it?
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Magic Utilities
magicutilities.net › magic-keyboard › help › bluetooth-pairing
Magic Keyboard Bluetooth pairing - Magic Utilities
Enter a given numeric code on the Apple Wireless Keyboard and press return. Enter 1234 on an existing main keyboard (can be the on-screen keyboard) and click Allow (or press Enter), now enter 1234 on the Apple Wireless Keyboard and press return. In Windows 10, sometimes your device is paired, ...
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Apple
cdsassets.apple.com › live › 6GJYWVAV › user › ma1780_smart-keyboard-numeric-keypad-2017-ug.pdf pdf
English 1 Welcome to your Apple Magic Keyboard with Numeric Keypad
with Numeric Keypad · Your Apple Magic Keyboard has a · rechargeable battery and uses Bluetooth® · technology to connect wirelessly to · your Mac. This guide shows you how to use your · Magic Keyboard, including pairing, customization, and recharging the battery.
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Apple
support.apple.com › en-ca › 119917
Set up your Magic Keyboard, Magic Mouse, or Magic Trackpad with your Mac - Apple Support (CA)
Magic Keyboard, Magic Keyboard with Touch ID, Magic Mouse, and Magic Trackpad work wirelessly via Bluetooth when turned on and paired with your Mac.
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MacRumors
forums.macrumors.com › macs › desktops › imac
What's the bluetooth pairing button on the Magic Keyboard? | MacRumors Forums
June 8, 2019 - Another hour of looking and I found it, it's CMD+W, for whatever reason. Command + W, CMD plus W, CMD and W. Apple Magic Keyboard. Windows pairing. Force pairing mode. Force discovery mode. Shortcut. Pairing mode shortcut.
Find elsewhere
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TechRepublic
techrepublic.com › home › how to connect an apple wireless keyboard to windows 10 and windows 11
How to Connect an Apple Wireless Keyboard to Windows 10 and Windows 11
October 8, 2024 - Click the option that says either Magic Keyboard, Apple Magic Keyboard w Number Pad or Apple Wireless Keyboard depending on which model you have and click the gray Pair button (Figure C).
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Apple
support.apple.com › en-ca › guide › mac-pro › apde6983e835 › mac
Magic Keyboard with Touch ID and Numeric Keypad - Apple Support (CA)
You can use Magic Keyboard with Touch ID and Numeric Keypad anywhere within range of your computer. When you need to charge the keyboard, or if you need to pair it again, connect it to your Mac Pro using a USB-C Charge Cable.
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Amazon
amazon.com › Apple-Keyboard-Numeric-Wireless-Rechargable › dp › B071ZZTNBM
Amazon.com: Apple Magic Keyboard with Numeric Keypad: Wireless, Bluetooth, Rechargeable. Works with Mac, iPad, or iPhone; US English - White : Electronics
Dre ... WIRELESS, RECHARGEABLE CONVENIENCE — Magic Keyboard with Numeric Keypad connects wirelessly to your Mac, iPad, or iPhone via Bluetooth. And the rechargeable internal battery means no loose batteries to replace.
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Techwalla
techwalla.com › tech support › how to
How to Switch an Apple Wireless Keyboard to Discoverable Mode | Techwalla
February 9, 2017 - In iOS or Android, turn on "Bluetooth" in Settings, and in Windows, open Control Panel and select "Add a Device." Your device shows a pass code and a countdown timer, and you must type the numeric code on the keyboard and, to pair the two devices, ...
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pupungbp
pupungbp.com › how-to-pair-apple-wireless-keyboard-with-windows-10
How to Pair Apple Wireless Keyboard with Windows 10 / Windows 11 — pupungbp
October 6, 2022 - On windows, go to bluetooth system settings; press Windows Logo on your keyboard and type “Bluetooth and other devices settings” ... Your Apple Magic Keyboard should be on the list, select that.
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Best Buy
bestbuy.com › best buy › computers & tablets › computer accessories & peripherals › mice, keyboards & accessories › computer keyboards › wireless & bluetooth keyboards › apple - magic keyboard full size with numeric keypad (lightning port) - silver/white
Apple - Magic Keyboard with Numeric Keypad - Silver
Apple - Magic Keyboard full size with Numeric Keypad (Lightning Port) - Silver/White
Magic Keyboard with Numeric Keypad features an extended layout, with document navigation controls for quick scrolling and full-size arrow keys for gaming. A scissor mechanism beneath each key allows for increased stability, while optimized key travel and a low profile provide a comfortable and precise typing experience. The numeric keypad is also great for spreadsheets and finance applications. And the built-in, rechargeable battery is incredibly long-lasting, powering your keyboard for about a month or more between charges.
(4.8)
Price   US$129.99
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Wikipedia
en.wikipedia.org › wiki › Apple_keyboards
Apple keyboards - Wikipedia
1 day ago - The Magic Keyboard is Apple's current design of external keyboards designed for use with Mac computers. It can use either wireless Bluetooth connectivity, or a wired connection via a USB to Lightning cable. It utilizes scissor-switch key mechanisms, and comes in several layouts and colors, including the option of a Numeric Keypad, Touch ID fingerprint authentication, and colors to match each color variant of the M1 iMac.
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Apple
apple.com › all accessories › mice & keyboards › magic keyboard with numeric keypad - us english
Magic Keyboard with Numeric Keypad for Mac models - Apple
Magic Keyboard with Numeric Keypad - US English
The Magic Numeric Keyboard features a sleek new design and a rechargeable battery that powers it for a month between charges, and pairs automatically with your Mac.
Price   US$129.00
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Apple
apple.com › all accessories › mice & keyboards › magic keyboard with touch id and numeric keypad for mac models with apple silicon (usb–c) - us english - black keys
Magic Keyboard with Touch ID and Numeric Keypad for Mac models with Apple silicon (USB-C) - US English - Black Keys - Apple
Magic Keyboard with Touch ID and Numeric Keypad for Mac models with Apple silicon (USB–C) - US English - Black Keys
Magic Keyboard with Touch ID and Numeric Keypad features a sleek design and a long lasting rechargeable battery and pairs automatically with your Mac. Buy now.
Price   US$199.00
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Best Buy
bestbuy.com › best buy › computers & tablets › computer accessories & peripherals › mice, keyboards & accessories › wireless & bluetooth keyboards
Apple Magic Keyboard full size with Numeric Keypad ...
Shop Apple Magic Keyboard full size with Numeric Keypad (Lightning Port) Silver/White products at Best Buy. Find low everyday prices and buy online for delivery or in-store pick-up. Price Match Guarantee.
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Beetstech
beetstech.com › product › apple-magic-keyboard-with-numeric-keypad-silver-white-mq052ll-a
(A1843) Apple Magic Keyboard w/ Numeric Keypad - MQ052LL/A
Magic Keyboard with Numeric Keypad, Silver/White
Apple Wireless Magic Keyboard w/ Numeric Keypad in silver w/ white keys. Connects wirelessly to any Bluetooth-enabled Mac computer. Model A1843, MQ052LL/A, MXCJ3LL/A. Powered via built-in lithium-ion battery & recharges w/ Lighting cable.
Price   US$92.65
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Apple Community
discussions.apple.com › thread › 252505391
Magic Keyboard with Numeric Keypad compat… - Apple Community
March 2, 2021 - Will the magic keyboard work with my iPad Pro model MQDA2LL/A [Re-Titled by Moderator] 1025 3 ... We understand you're looking to purchase a keyboard for your iPad Pro 12.9-inch (1st generation), and we'd like to see if we can help. You're correct that the Magic Keyboard with Numeric Keypad is not ...