@vitaliy_kh , thanks. Unfortunately this also does not solve my issue. I continue to need to debug. It's a shame, the device is a key component in other automations.
Are you sure there isn't a device in the section circled in my screenshot below? Your second screenshot is cut off, so we can't see if there is anything else there.
To get this I added a device to Hubmesh on the source hub, in my case my C5 in the screenshot below. Then on the destination hub, I had to hit the refresh symbol next to the search box. Then after maybe 1-2 seconds, this new device that I circled showed up. You then have to hit the next to the device name to add it to the destination hub. It will move to the upper section and be available on your hub.
Turn off hub mesh in the Device page, reboot both hubs. Turn Hubmesh back on in the device page, and see if that makes it show up? I would probably check the database rebuild checkbox (advanced options) when you do the reboot.
Maybe support needs to be tagged for a bug report?
No dice. I had previously tried toggling Hub Mesh on the device page, but I had not tried the reboot. I added that last night, including the database rebuild. Still no change.