Performance Test didn’t return any results

I just installed and activated Hummingbird. After activation, I went to the Dashboard and tried the Performance test, I get the message below”
“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”

I’ve tried this multipla times with the same result.

I do not have any other cache plugins installed