Per the trouble ticket suggestion, I attempted to connect using the connection tool and manual connection settings to the router: I wanted to connect and see the manual IP address on the router table. OK, I thought I would try to connect directly to the AT&T roputer and bypass the wi-fi extender, since that was successful before. The Skybell Slim Line we are told only have ADC firmware and wouldn’t work with Skybell, but we have not tried doing so. This does not require setting up service of some sort, just following instructions through the Skybell app.
If you have a Skybell HD (round) you can simply use the Skybell App to set it up if you wish and see if there is any difference in device response. To verify: are you using a distinct SSID with the extender? You aren’t using the same SSID and password as the router, correct? We do not use the EX2700 for networking purposes.
This likely points to an issue with settings if you still see it hanging on Orange, and why it was suggested to make sure the translated MAC was added. If you have internet access on a phone through the extender, you should be fine installing the Skybell. Truthfully I do not see a further reason why the Skybell should not function through the extender. The fix was simply manually setting the IP address for the Skybell and Extender. The issue here originally was that the Router would not complete DHCP allocation for the Skybell or the Extender. There is no different process through Skybell. You have already proven able to connect the Skybell via that Router - that is the extent of the fix.