I saw this before, but don't remember the problem or the fix.
1st guess: Client name too long: 22 characters ?
KC8SLY-MONTGOMERYFARMS
73, Chuck
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That field on the Tunnel Server page is for the Public IP address or the Dynamic DNS name which people will use to reach your tunnel server from the Internet. https://arednmesh.readthedocs.io/en/latest/arednGettingStarted/advanced_config.html#tunnel-server-node-settings