Please note: The main purpose of this issue is to give and collect advice how to deal with the following problem. Your comments may be edited/deleted if they don't serve this purpose.
Description of the problem:
If players try to execute commands, the (server) console prints "Could not identify <playername>. [...]" while the ingame console prints "Uups, I don't know you! [...]".
This problem is only occurring on some servers and it is unclear why this happens.
Help to fix:
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