Acoustic Bridge not working

I installed the trial version of Acoustic Bridge on 2 of my computers 3 days ago.

On installation, the software appeared to not be working. I traced it to the fact that Microsoft Firewall was active.

It suddenly started working and was an absolute game changer because how good it appeared to be.

Today however, no sound is being played from the sending computer.

The receiving computer runs on Windows 10 while the sending computer is on Windows 11.

Both systems seem to have "Receive Audio from" and "Send audio to" information the same. I made up a new password and entered it on both systems so they both have exactly the same data. Both firewalls are off. 

I cannot get this to work.

Is there any suggestion in order to get this to work - it really is a good utility if and when it works. There is no point buying it if there are constant issues with function.

Anyone with any suggestions would be much appreciated.

Thanks

CR.