How do I add additional accounts in Teams to switch to? Guests?

I have been going round and round with "Microsoft" support but to no avail does this 3rd party know Teams.

So, let's start easy, I have a client who is managed under GoDaddy so they do NOT have access to Admin. They do have access to Entra and Azure portals though.

They invited me as a guest in Azure. And all of a sudden I have a second account I can switch to in Teams.

I did the same invite in Azure for another client but I do NOT see a second sub-account to switch to. Why and what is the easy process to add sub accounts for my clients that I can switch to?