Is the “Allow Access via Remote / Cloud” setting checked in the Hubitat portal? (not the one in Home Remote app)
Do the cloud URLs work on the Maker API setup page?
I wonder if there’s maybe a device you have that it cannot poll. Can you try removing all of your devices but 1 or 2 on the Home page? Just add a switch or light to the Home page. Close & reopen the app & see if it’s able to update those 1 or 2 devices.
Would you be open to creating a temporary Maker app that I can test? Let me look at it to see if I can figure out why it’s not working.
The initial validation in Home Remote only sends a request to the “modes” URL. If that succeeds then it assumes the connection is good. If it were my guess, the cloud URL for “Get Device Info” is locking up for 1 of your devices. I’d like to go through & test those with your setup.