I am having the same issue.  I have tried with three browsers and two different computers.  Tried clearing Garmin cookies.  Have not found a solutions.  Very frustrating.

2228373 Hello, we are aware of the issue and are currently working to resolve it. I am going to send you a private message to look into this further. 

I am getting the same error when trying to access the map share link on am android phone in Google chrome. Was this fixed for others?

Same Error! 

Same error!!!

To reiterate, this is due to Garmin single sign-on.

Sometimes (not always, apparently) clearing ALL Garmin history and cookies (regardless of the domain or sub-domain) will clear up the issue. Incognito mode (or whatever your specific browser calls it) will also avoid the issue (because it does not inherit any cookies). The same is true of using a different browser WHICH YOU DO NOT NORMALLY USE TO CONNECT TO GARMIN properties. If you use it to connect to Garmin properties, it might also harbor persistent cookies.

The other thing to check is whether you are using a proxy. If so, disable it.

The error crops up periodically. SSO uses an insane number of redirects. Depending on the exact state of the cookies in YOUR browser, you might hit it. Or not. 

Nice Its amzing