Update: Saturday, 22 April 2017 02:44 UTC
Users should now be able to access the market place without any issues.
During this impact window (Start Time: 2017/04/22 00:00 UTC (2017/04/21 17:00 Pacific) and End Time: 2017/04/22 00:10 UTC (2017/04/21 17:10 Pacific)) users might have faced connectivity issues on Market and might have got 500 errors.
This issue was mitigated once the SQL azure issue was fixed by the partners team.
Sincerely,
Venkata Sainath Reddy