Unable to use the generated conf file on Debian for client

I have a working wireguard server, installed with the help of your script and it works perfectly.

I've created a new wg client/user for a new device, that runs Debian 12.
However, on it I got this error:

```
Line unrecognized: "Address=10...."
Configuration parsing error
```

in response to

`sudo wg setconf wg0 wg0-client-XXX.conf`

Any ideas how to get around this?
Is there any good GUI WG client for Debian? I've found one, but looks abandoned (last update 2 yrs ago) and looks very bulky (80MB+ seems a lot!).

Thanks.