I have several inaccuracies. For the wireguard interface (the upper address field), you should choose a different network from the main one. For example, 192.168.1.1, the same can be said about the client’s address (lower address field), for example 192.168.1.2
In the field client_allowed_ips: you should specify the address of the router and the address of the wireguard. For example 192.168.0.0/24
192.168.1.0/24