I'm getting this message when trying to activate? I've done this many times, same server setups, not sure if the problem is on my end.
Your server had a problem connecting to WPMU DEV: "HTTP Error: 403 "Forbidden"". Please try again.
If this problem continues, please contact your host with this error message and ask:
"Is php on my server properly configured to be able to contact https://premium.wpmudev.org/api/dashboard/v1/ with a POST HTTP request via fsockopen or CURL?"