I got a toast on my left sidebar saying -
"Stack Overflow for Teams is moving to its own domain! When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com.
Check your email for updates."
I checked my mail and this was mentioned:
You will be able to access your private team from stackoverflowteams.com. Private teams will no longer appear in the left sidebar on stackoverflow.com and will not be accessible from the public site.
Is this true for the rest of the network as well? I actually tend to check Teams from MSE and SU. This would result in a minor rejigging of my tabs but I can imagine this could change the workflow for some.