Well, this thread highlights the issue that I have been having the last few months with my TEAMS account free which I set up using my work email account!
When covid19 started, I set up a trial account of TEAMS free using the outlook.com email address that i use for personal emails, and sent invitations to all of my work colleagues work email addresses asking them to register for personal microsoft.com accounts in order to gain access. I sent one to my work email address too, and set up a personal microsoft.com account.
It all worked pretty well until a few months ago when I was no longer able to log in to the TEAMS free account using my work email address. I assume that this may be because I had been subscribing to various Office 365 plans under my work tenant which was connected to my work email address. Or maybe because I have a ONEDRIVE FOR BUSINESS account tied to my work email address, which I guess would have connected my work email address to Azure AD, in addition to Microsoft Account.
I have been planning to migrate my SMB office (50 persons) to Office 365 and the paid TEAMS account, and was hoping that our employees would be able to log in to both the TEAMS fee account, and the TEAMS paid account at the same time by selecting WORK OR SCHOOL account or PERSONAL account at log in, and then copy and paste any existing files or wikis or whatever between them, but am afraid this would not be possible.
What to do!