I have two devices: Edge 500 and Forerunner 220
I was having problems with my Edge 500, so I deleted it from Garmin Express to try to resolve it. When I try to add it back in (Add a Device), it prompts me to Sign In, and when I do, it tells me that "There was a problem connecting to the Garmin servers. We're unable to sign you in because our servers are unavailable at this time." However, my 220 syncs no problem. It simply won't allow me to add my 500. And I know that the servers are available, because if I purposefully put in the WRONG password, it tells me "Invalid sign in. (Passwords are case sensitive.). So it clearly hits the authentication portion of the process. I only get the error when I use the correct password. I have tried signing in with both my Email and my username, but get the same results. I have been having this issue for weeks now.
For the last several weeks, I just have to manually import my rides using the Garmin Connect website by manually importing the file, which works just fine. It would be nice to just have Express do it for me though.