It might be worth a call to Orbi tech support and focus on not being able to access the Orbi's UI via a laptop browser. Once you get that running I'm guessing HE starts working just fine.
Out of curiosity do you have the same issue whether you are plugged into the "master" orbi?
Everything just started magically working. Was able to browse to both hubs, able to browse to my Orbi admin. All was good. Note: WAS.
Today I tried again, in vain, to get Hub Mesh to work. (Hubs not seeing each other). I did all the things like enable multicasting etc. Still nothing. I found a post here that had some steps to fix it:
disable
reboot
enable
reboot
disable
turn around 3 times
enable
Or something like that.
But then it all went wrong. Simply put, when I disabled Hub Mesh on my primary hub, I wasn't able to access the hub directly anymore (I can with Remote Admin... )
Anyway, guess I'll wait a few days and see if it clears itself up. This does seem like an issue to me...