Hi,
As discussed via PM, your ISP currently provides a private IPv4 address (CGNAT) instead of a public IPv4, which prevents Brume 2 from accepting incoming VPN connections.
After attempting to switch to IPv6, everything is working properly.
But please note that the WireGuard client must also have IPv6 connectivity for the VPN to work.
Please contact your ISP to confirm whether a public IPv4 address can be provided for more versatile usage.
If you decide to reconfigure the VPN in the future, the following guide outlines useful troubleshooting steps for WireGuard:
How to Troubleshoot WireGuard