API and curl/fsockopen error message; Whoops, your server is having trouble connecting to the WPMU

The last series of discussions that I’ve been able to find in the forums on this issue was 2014. None of them had an answer I could use. I just installed the white label videos on a site that is also running the WMPUdev Dashboard, CoursePress and MarketPress. When I installed the videos I got the message, “Whoops, your server is having trouble connecting to the WPMU DEV API! If this problem continues, please contact your host and ask them to “make sure php and any firewall is configured to allow an HTTP GET call via curl or fsockopen to https://premium.wpmudev.org/video-api-register.php.”

Both the curl and the fsockopen function are configured properly for port 80, which is standard. There isn’t any firewall interference. PHP is version 5.6.21. This is the only plugin that isn’t working. What, if anything, am I missing?