I've also tried this as well and today did a fresh install in our test environment and got similar results only this time it says the horizon certificate is missing.  I've definitely exported the self-signed cert created during the Horizon 7 install to the correct location on the JMP server yet still no luck.

At this point I'm at a complete loss for where to go next and feel like a crazy person.  Anyone have any other suggestions or experienced similar issues?

Thanks for everyone's response already as well.  Appreciate it!