Greetings,
Apologies for the delayed response.
We don’t currently have a specific configuration example for setting up WireGuard with a FritzBox. However, the process on the RUTC50 side should not differ. Have you looked at this configuration example? WireGuard Configuration Example - Teltonika Networks Wiki
Could you also clarify which device is acting as the server (the one with the public IP)?
Please have a look at this topic as well as it walks through the full WireGuard configuration between a Teltonika router and a FritzBox:
If you’re still unable to get it working, please share screenshots of your configuration (excluding any sensitive information).
Best Regards,
Justinas