Azure DevOps - Sprint 191 Update
Features
Improved web experience to better handle re-authentication requests
Some of you have encountered the following error message Unexpected token < in JSON at position 4 when your authentication token has expired. This can often happen when you attempt to save a pending work item or select a coworker from the Identity Picker.
With this update, we included a fix to improve the reauthentication experience. Now you will be able to successfully complete the sign-in process without data loss.
Next steps
Note
These features will roll out over the next two to three weeks.
Head over to Azure DevOps and take a look.
How to provide feedback
We would love to hear what you think about these features. Use the help menu to report a problem or provide a suggestion.

You can also get advice and your questions answered by the community on Stack Overflow.