Temporary fix for us is to Reverse the MFA setting. For a user who is enforced we disabled the MFA policy (Not Conditional access) and for a user with MFA disabled we enabled. Not sure yet why making this change fixes the issue but presume it makes AVD re-evaluate the authentication methods allowing access to the feeds. Hope this helps someone!
  Support for converting from WES to ThinOS Ring Central Support ControlUP Support [IMAGE] Package Updates Citrix_Workspace_App_22.9.0.21.3.pkg● EPOS_Connect_7.2.0.29149.1.pkg● HID_Fingerprint_Reader_210217.18.pkg● VMware_Horizon_2209.8.7.0.20616018.3.pkg● Identity_Automation_QwickAccess_2.0.3.1.1.pkg● Imprivata_PIE_7.9.000.0023.1162.pkg● Jabra_8.5.5.1.pkg● Cisco_Jabber_14.1.2.307144.7.pkg● Teradici_PCoIP_22.07.3.16.pkg● Cisco_WebEx_VDI_42.10.0.23814.5.pkg● Cisco_WebEx_Meetings_VDI_42.10.5.15.3.pkg● Microsoft_AVD_1.9.2017.pkg● Zoom_Citrix_5.11.9.21750.8.pkg● Zoom_Horizon_5.11.9.21750.8.pkg● Zoom_AVD_5.11.9.21750.5.pkg● ControlUp_VDI_Agent_1.0.0.1.26.pkg● RingCentral_App_VMware_Plugin_22.3.30.1.pkg Admin Guide [URL] Release Notes [URL]    
ThinOS 2211 (9.3.3099) has been released