Found this other article and one of the replies suggested the GUI give no indication of acceptance. You just need to restart HM and it uses the new cert. I did so and it did work. Very lame that there is no indication in the GUI of success or failure...
I have this exact same problem and came to the Community hoping perhaps the answer was here. Since you have not received a response in a month did you end up contacting support? Found this other article and one of the replies suggested the GUI gi...