We just announced an update to our Windows Desktop App. For all our customers who have been facing issues logging in into the app using "Login with CA Agile Central" option will now find the issue resolved.
In case you are still facing issues, check this KB article
Don't forget to download the latest app from our downloads page.
If you have any questions, feel free to post them as comments below and we will do our best to have them answered as soon as we can!