I have a 20+ Poly x50s and TC8s in Teams mode. The volume setting to hear remote attendees has never needed to be changed from the default on the TC8 but after upgrading them to 184.108.40.2066092 and using Teams 1449/220.127.116.112120503 the volume is very quiet. The settings on the TC8 needs to be increased to 90%.
I have 1 unit I am testing with Teams 1449/18.104.22.1683031201 and the issue is the same. MS has just released another version (1449/22.214.171.1243041207) which I am not looking at yet as they have not released any notes on it.
The only audio settings changed from default I am applying to in LENS policy is: Enable Polycom StereoSurround
No other settings have changed in the webgui.
Audio was not a problem with 3.14.1 before the upgrade.
edit: the TC8s are running Teams 1449/126.96.36.1992120503