Call audio failed to relay for one peer of four to one other peer

**Describe the bug**
In a call of four, the audio relayed fine for users 1, 2, and 3; but user 4 could not hear user 3.

**To find in logs**
My user name is jimkillock ; the call was approximately 14:05 to 14:25 GMT
The user with relay problems was in Maidenhead

**Expected behavior**
All users should hear all users

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Desktop (please complete the following information):**
- OS: MacOS
- Browser [e.g. chrome, safari] Safari
- Version 15