Teams is shit though. It is basically WhatsApp or messenger. Read something then forget all about it. Email combined with a Monday board is great. Teams is bad for tracking and evidencing.
We have comms at work guidance…
In person if it’s important enough to interrupt someone’s work and/or needs a collaborative response. Don’t just ask a question that you could look up yourself – your work/time is not more important or valuable than anyone else’s
Phone, as above if you’re not located in the same place.
Email if it is informational or enduring. Don’t use for conversational type stuff. Remember it can be produced in court. Don’t use for personal stuff. Make sure it’s got an appropriate security classification on it
Team chat/channels – literally chat. Don’t use for recording project decisions or anything enduring.
Project/business related documentation must be in an appropriate document repository or wiki and classified.