A valid admin site in Office 365 is always https://tenant-admin.sharepoint.com

Tenant is the .onmicrosoft.com name that you choose when registering for a subscription.
Tenant Account Setup

Whether you choose a vanity domain, change the name of your public website, the admin url always remains: https://tenant-admin.sharepoint.com

Answer from grisha on Stack Exchange
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Microsoft Learn
learn.microsoft.com › en-us › sharepoint › manage-sites-in-new-admin-center
Manage sites in the SharePoint admin center - SharePoint in Microsoft 365 | Microsoft Learn
Note that you may see differences between the sites in the active sites list and those listed in the SharePoint site usage report in the Microsoft 365 admin center because both the site templates and URLs listed above are included in the SharePoint site usage report.
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r/Office365 on Reddit: Can I get access to SharePoint admin center without having access to full 365 admin center?
September 24, 2024 -

I don't have a lot of experience with Microsoft SharePoint, so everything I'm about to say is what I found out on the interwebs, so if I'm completely wrong, please let me know. I recently took a job that requires me to create and maintain SharePoint sites for our organization, so I told my manager I needed to be designated a SharePoint admin so I can create the hub site and customize the colors for branding. This morning he told me our IT guy set me up as SharePoint admin, but when I try going into the admin center, I am unable to get in through 365, and when I try the URL workaround it says the site can't be reached. I'm assuming I can't just be a SharePoint admin without becoming a full admin, but wanted to double check here.

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If you have Office 365 operated by 21Vianet (China), sign in to the Microsoft 365 admin center, then browse to the SharePoint admin center and open the Active sites page.
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The address of the Central administration uses a port number established in the SharePoint installation process. If you don't know the Central administration URL, you can check with your IT admin, or you can get it directly on the SharePoint server with these steps:
Top answer
1 of 2
1

Generally, the central admin URL would be with below format after installing the SharePoint:

http://machinename:portnumber

Here the port number will be the one that you have given during the installation.

The MSDN article says CA port number can be changed using the below PowerShell command:

Set-SPCentralAdministration -Port 8282(example - you can give your own number)

MSDN Source:

Set-SPCentralAdministration

You can try the above step.

And also we can change the central administration URL by other ways:

How to change the URL for SharePoint Central Administration site

To change the URL for SharePoint Central Administration URL:

  • Open Registry editor
  • Backup the registry before making any changes!!!
  • Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\Web Server Extensions\12.0\WSS and change the value of CentralAdministrationURL to whatever you want to be

References:

How to change the URL for SharePoint Central Administration site

How to change the URL for SharePoint Central Administration site

2 of 2
0

it is recommended that you need to create a separate web application (other than CA) for regular use. CA web application is back-end work and it is only provision on 1 server and if you have multi-server environment then it will not provision on other servers ( Web front ends).

what i recommend:

  1. Create DNS Alias which point to the server or Load balancer
  2. Create a Web Application in the Central admin and use the DNS in it
  3. Create a root level site collection
  4. Update the AAM via central admin

Lastly, in your case, you have to backup the existing Site collection and Restore it to new web application.

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To add a new Microsoft 365 tenant to SharePoint Manager Plus, you will need the admin tenant URL. Using any other URL than the tenant URL will result in a connectivity error. An ideal tenant URL will look like https://<TenantName>-admin.sharepoint.com.