If the OP's method doesn't work, try changing the default INBOUND rule for Ghost Recon Wildlands from Protocol: UDP to Protocol: Any.
Once I did that, the App sync'd up instantly.
Outbound rule shouldn't be needed.
If you still face same issue, Get the latest version of app from Tutuapp store and try again.
On Windows PC, GRWQ (on IPad) does not sync on UDP ports, its syncs on TCP 8080.
After pulling my hair out and opening up my firewall I found that something else was running on 8080 (netstat -nao). Once I killed that process (I had IIS express running for some reason) and restarting GRW, I could finally sync the app.
I only have the map working at this time and sending resources to GRW does not seem to be doing anything though.
Maybe this will help others who cannot even get the map...