Hello,
In your FritzBox configuration, I can see that you have your FritzBox LAN IP set instead of the WireGuard server IP:
This is an older screenshot I’ve made for a different client, but in your case, it says 192.168.1.2 here, which I don’t believe is correct.
Next, this IPv4 section is for the WireGuard interface IP, not the LAN subnet:
This IP can be pretty much anything, for example, 172.16.10.1/24 or even /32, doesn’t matter.
Next, the peers list:
You have added yourself to the peers list, instead of the FritzBox (peer device), which you are trying to reach.
Please double-check these settings and make sure they’re correct as per the instructions.
Thank you,
M.