Android VPN won't connect on Wifi Network, working fine with Operator Network

Hi guys, it seems the Bitdefender won't work well with WiFi connections on Android devices. The VPN keeps disconnecting after 2 seconds of connection. However, the connection went well on the operator network. I'm not sure what I've missed, I tried all the recommendations coming from the list below, but nothing works.

Devices I'm using are

  • Samsung Galaxy Tab A7, Android 12
  • Pixel 3A, Android 12

VPN connection working well on iOS, Mac, and Windows on both connection of WiFi and Operator, and I have no other VPN app installed