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Humm he means figure out everything you’re signed in to before going on vacation and log off?

Personally I’m sure I’d forget to sign out of something.

No, they don't mean "you should log off everywhere" literally; rather, "don't open Teams/Slack/${our_corporate_chat_software}".

Do these things even close on mobile? I'm pretty sure I'm always on on everything. I'm good at ignoring them though.

Probably more Teams autostart and suddenly you appear in the online list when you are officially on vacation.