The performance test didn't return any results

Hi SuperHeros,

Performance Test is showing no results, tried multiple times. I only receive the below message. Please let me know to fix this issue.

The performance test didn't return any results. This probably means you're on a local website (which we can't scan) or something went wrong trying to access WPMU DEV. Try again and if this error continues to appear please open a ticket with our support heroes

Regards
Gautham