People that call you out of the blue on Teams without messaging you first.
Just because I'm on green doesn't mean I am immediately available for a call!
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I'm not sure i 100% agree with you on this one, but everyone has their different ways of working, i suppose.
The whole idea of Teams, etc., is to enable more flexible working amongst colleagues who are scattered to the winds, but it depends also on how people like to work. Personally, i'm happiest getting my thoughts down "on paper" and sending emails, but my boss will always call me on Teams for a quick chat. Often, it is quickest to get resolution on something from a 2 minute chat - but people do need to respect your boundaries.
If i want to talk to a member of the team, i'll drop them a note in Teams to say "Got 5?" or "Free?", then i would hope that they would either call me or say "Yep" and i'll call them.
There are different status indicators on Teams which allow you to be "Focussing" or "Do not disturb", and that will block certain callers, but if you are green, it's open season , subject to being polite!