server keeps saying it needs the player to install

Hi,
    This is only happening when the player tries to connect via the custom domain. When the player uses the IP it works fine.



It’s been properly configured and checked by NameCheap support.



could anyone help me with why this is happening??





any help with this issue would be appreciated?


Please help.

Thanks!

I didn't find the right solution from the Internet.

References:
www.minecraftforum.net/forums/support/server-support/2880280-server-keeps-saying-it-needs-the-player-to-install

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