I have tried to sync my site from the Hub and also by installing WPMUDEV Dashboard plugin. When I try to sync from Hub it shows "We hit a snag while auto-installing the WPMU DEV Dashboard plugin on " and when I tried to install the plugin manually and tried to login from the admin it did not work.
"Is php on my server properly configured to be able to contact https://premium.wpmudev.org/api/dashboard/v2/ with a POST HTTP request via fsockopen or CURL?"
I have contacted my host and they confirmed that it should be fine.
I'm sorry that this is not working.
It might be that we are blocking this site IP address on our side, hence this error. I have requested from our sysadmin to check this site IP and if it is blocked to unblock you.
As soon we will get more info we will update you.