FYI – https://support.citrix.com/article/CTX253754
User called to say Audio/Video devices were failing to pass through to MS Teams. Under Settings > Devices listed “None” across the board:
Checked the local workstation and found the HDXTeams.exe was not running (should start automatically when Teams in Citrix launches)
Logs are here: %userprofile%\AppData\Local\Temp\HDXTeams
Refer to : https://discussions.citrix.com/topic/407820-ms-teams-not-pulling-through-audio-devices/page/2/
Solution: I had to disable built-in microphone and speakers – one or both of these were the problem:
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