Days of trial and error lead me to suspect it’s the Xamarin version that the VS2017 update also updated which has broken it. The problem is Microsoft ties Xamarin versions in with VS version now, so downgrading Xamarin to a version that works loses support for Android SDK 26 which is now a mandatory minimum on the Play Store.
Mainly been debugging on Android but also happens with iOS. Tried multiple Android SDK versions but doesn’t seem any correlation here.
Building same code with VS prior to VS2017 (which we have on our VSTS CI server server - VSTS’s Hosted agent) sees things working fine as they have been for a long time. Using VSTS’s “Hosted VS2017” agent suddenly breaks lock again like local installation of VS2017.
Have tried OIDC flow using Auth0.OIDCClient and previous non-OIDC lock using the old Xamarin.Auth0Client - both exhibit the same freezing behavior with LoginAsync.
Can’t see any error information as to why Lock freezes with ‘hourglass’ stopping. Auth0 dashboard shows successful login.
Thinking I might have to abandon the lock unless someone knows what might cause this.