List guest teams like Yammer
Instead of having to select tenant, pls have all teams in one list and mark those in other tenants with a globe. Much like Yammer.
Also have notifications displayed in the same manner. I.e one experience for everybody with no need to switch tenants.
It would give everybody a clearer and easier way of keeping track of all your teams, no matter of where they reside.
This cross-tenant functionality is crucial to making Teams a functional tool in complex orgs. Being able to color-code the various teams would be extremely helpful to help differentiate between tenants as well as other functionality.