How to open allowlist on Bedrock server?

Bedrock Dedicated Server uses the allow-list setting for accepting players. Define the allowed user with the Bedrock gamertag.

Step by step

Shut down the server properly and set allow-list=true in file server.properties. Backup your world and permissions files.
Open the server. Add the player with allowlist add "Oyuncu Adi" from the console. If there are spaces in the gamertag, use quotes.
Check the name is spelled correctly with allowlist list. Use allowlist remove "Oyuncu Adi" to remove access.
Log in with the authorized Bedrock account and verify that the unlisted account is denied. If there is a wrong port or version error, fix that problem before changing the allowlist.

The Java server using Geyser and the standalone Bedrock Dedicated Server may not use the same permission flow.