February 2022
This is due to a known error with the Advocate Network (default clan for Multiplayer). There is a fix for this, that resets the clan every time you sign in.
Open Origin > Library > TF|2 > Settings > Game Properties > Launch Options > type this in: +communities_enabled 0
Since you are on PC, I recommend getting the Northstar client. It is a custom client that gives you custom game modes, skins, servers and mods, and has a more active player base atm.
Hope this helps, Pilot