I work in an organization using Gsuite under the domain asdf.com. We also own the domain qwer.com, we also have a website on that domain, and actually several other websites on subdomains under qwer.com. We have a "main" administrator, who is in charge of asdf.com and our Gsuite. However, I am (somewhat unofficially) the administrator for qwer.com.

The problem? I've implemented company-only Google-authentication for logging in on several of the subsites under qwer.com, one of which should also be accessible by users from erty.com, a company we have nothing to do with, except that their users should have access to this site.

Earlier, I guess I would administer this by logging into the Google admin console. All of this has now disappeared. If I try to log into admin.google.com using my asdf.com e-mail address, I'm told that only an administrator of asdf.com can do that. (We all have adsf.com e-mail addresses - there are no qwer.com e-mail addresses.)

So basically, if I want changes done, I now need to go through the "main" administrator of asdf.com. He's a very busy man, and spends an absolute minimum of his time on admin.google.com - he probably has no idea how to implement the changes I need done.

So I've been told that I need to tell him exactly which changes I need. In order to do that, I need to be able to log into the google admin console, since I don't remember what it looks like - it's been a while.

I could start a free trial using my personal domain, but that seems short-sighted.

Ideas are welcome.