_Georggi
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To @Greymagic27, please review [MC-267771] Unable to /whitelist add : "That player does not exist" - Jira (mojang.com) again. `/whitelist add` command uses POST https://api.mojang.com/profiles/minecraft via mojang.authlib (You break your own library, it's not just custom libraries people write) on all versions below 1.21.1. While you may say that you only support snapshots + 1.21.4, by removing an old endpoint you break all dedicated servers, which used whitelist as well. You can't simply update a server to a new auth library jar.
Hopefully no one minds, will add the same information as in my request to reopen this bug report in WEB-5959 to not lose it. This bug affects all versions below 1.20.1 too.
The issue is dedicated servers use com.mojang.authlib's API to get UUID for a given username by using POST https://api.mojang.com/profiles/minecraft (which is now removed) when adding to whitelist.