Using Teams with multiple organizations

To the best of my understanding it cannot be done. I have a similar issue, but logged into one of them I can be a guest in the other (as long as my logged in account is added). Sad to say but Microsoft decides how people should use their product and do not make changes easily. Office 365 has been a nightmare for me and how I have used technology in the past. I can list a whole lot of things that OneDrive, Sharepoint, Teams stinks and does not permit customization. You have to use it the way MS decided with way too many details hidden behind the scene - because MS thinks users are not intelligent people. (Been that way since the beginning days of MS-DOS more or less)