SharpTools 2.2 has been released to Google Play. It may take several hours before the update is available to download.
Note that SharpTools 2.2 should fix things for users on the NA01 shard. After downloading the updated SharpTools release, please reauthorize your things from the SharpTools Settings screen to re-establish functionality.
SmartThings is working on synchronizing the changes across to the NA02 and EU shards and we expect this to be complete over the next 24 hours. Once the server sync is complete, NA02 and EU users should be able to reauthorize their things and functionality should return to normal.
NA01: graph.api.smartthings.com
NA02: graph-na02-useast1.api.smartthings.com
EU: graph-eu01-euwest1.api.smartthings.com
Edit: See post 29 for an update. SharpTools 2.2 R2 was pushed to Google Play on May 4th and should resolve the authorization issue.