Failed to authorize using the OAuth service

Hi
Just started get these errors during backup to Google Drive. Duplicati is installed on win2016 and just had the latest microsoft april updates.
Not sure if the updates have caused this.
It has been working perfectly up until now

17 Apr 2019 08:37: Cannot open WMI provider \localhost\root\virtualization\v2. Hyper-V is probably not installed.
17 Apr 2019 08:32: UsageReporter failed
17 Apr 2019 08:29: The operation Backup has failed with error: Failed to authorize using the OAuth service: Proxy Authentication Required. If the problem persists, try generating a new authid token from: Duplicati OAuth Handler
17 Apr 2019 08:29: Fatal error
17 Apr 2019 08:29: Backend event: List - Failed: ()
17 Apr 2019 08:29: Operation List with file attempt 5 of 5 failed with message: Failed to authorize using the OAuth service: Proxy Authentication Required. If the problem persists, try generating a new authid token from: Duplicati OAuth Handler

I still have this problem.
Tried a number of time to recreate the auth id then press “Test Connection” and it fails.
Rebooted the server, still the same.
Has any one got any ideas
Thanks in advance