How to Switch Between Multiple Organizations in Microsoft Teams

That article covers the basics quite well. One thing I have found helpful is paying attention to the activity notifications when working across different organizations, as it can be easy to miss something happening in another tenant. A warning symbol beside an organization name can also simply indicate that further sign-in or access is required, rather than meaning there is a serious problem. I also like using different visual themes where possible. It makes it a little easier to recognise which organization I am working in at a glance. Separate browser profiles can be useful as well, particularly when you regularly switch between several accounts. A few small habits can make the whole setup feel much calmer.