Always locating server
It showed Generating world: Locating server for a long long long time. I couldn't come into the world. At the backend (server, manage interface, just the computer which the server runs on it) I saw that I have ready connect to the server. I tried to type in list, it showed my gamertag. Then testfor @a, it said that No targets matched selector.
Environment
Server: Ubuntu 20.04, no resource packs, no behavior packs, not pocketmine, not nukkit, no plugins, just vanilla
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Resolution: Unresolved → Invalid

Thank you for your report!
However, this issue is Invalid.
This is a technical support issue; this site is for bug reports only. We do not have the resources to provide you with technical support.
Please contact the Community Support.
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This will sometimes happen if you have turned on the whitelist but have not whitelisted your account.