Morning all - has anyone encountered the below error when trying to open 365 apps in an AVD multisession host pool? Oddly enough, it is intermittent. Sometimes it appears and prevents apps from opening, other times the apps open. This was a teams log when the issue did occur:

2025-12-10T03:34:19.881Z Err CID[9caade69-9abc-40d7-b9d4-8f79644dfd76] useLoginMutation: [Core-Auth][useLoginMutation][7eb70b39-3dde-43c4-8899-1c30326f8cae] Mutation error thrown. Sign in failed with error: NoNetwork {"Description":"(pii)","Domain":"com.microsoft.oneauth","ErrorCode":"2606","Message":"Invalid authentication credentials for a proxy server. Authentication proxy

Got Zscaler or similar installed in your session hosts?