Re: Not office hours? No contact
Surely it's on them to manage this with permissions. If you can install a tool on your personal device and it's able to connect to your work systems then it's their responsibility to disable it if they don't want it to happen.
Last year I installed Teams on my personal mobile because it seemed like a good idea, but I didn't really use it. It just installed with no problems and connected fine. Obviously I set the times to my working hours so I would show as unavailable in the evening.
A few months later I went into the app because I was in a personal appointment, and after an update there was a message saying it needed to be a device admin so they could remote wipe. I just uninstalled it, I'm not allowing that.