embeded Nabble forum no longer works after enabling SSL

[shuguang44]

I have an embeded nabble discussion forum
but after we added SSL to the parent website, the embeded nabble does not seem to work any more

The parent website is
https://www.magnet.com

the embeded forum is  
https://www.magnet4water.com/magnet-discussion-forum.html

It used to work before we added SSL

Now I am getting the following error

Your connection is not private
Attackers might be trying to steal your information from magnet.80003.n8.nabble.com (for example, passwords, messages, or credit cards). Learn more
NET::ERR_CERT_COMMON_NAME_INVALID

Can you help?  We are scheduled to open up the platform with discussion to the world this coming Tuesday, Nov 6, 2018. You help is greatly appreciated

Thank you!!!!

[GregChapman]

See:
http://support.nabble.com/Https-Protocol-Request-tp7600969.html