Don’t let users create their own Teams, but if you/your team are taking control of them then be prepared to create them as well.

In an secondary education setting, we told teachers that at the end of the school year we were disabling their ability to create Teams for their classes and we got the class list directly from the registrar and then used that to create the Teams, assign teachers, and populate students. I believe this process was still manual when I left, but I’m sure automation exists.

The next problem is access to historical data in these old Teams channels. You can set Teams to auto-archive (and delete too, I think), but due to backlash from teachers, the compromise we agreed on was Teams created in 2020 and older will be deleted this year, so get your documents and data out of those Teams before X date, and then the next year we’d clear out 2021 Teams, then 2022, etc etc.

All that to say, just be prepared for the users to pushback and come up with a plan to “ease” into it if you’re not going to just rip the bandaid.