Can't login to 2 wifi routers configured as AP's by IP address

Thanks for the response, I think I was able to fix this this mornign actually. Well I fixed the issue with being able to login to the AP's by IP.  Still not sure the cause of my double NAT, that prompted me to set the AP's to bridge mode.

So the setup is this. Fiber internet into ISP's(think its call a NID) modem/router. The ISP also has a residential gateway that can do wireless, but I have that shut off. Then I have the R6400 in the basement as a wireless AP, and the R6400V2 on the 2nd floor setup as a wireless AP. I reset the R6400 downstairs again today and can now login to it via IP. The R6400V2 upstairs even though the ISP's router reported it using 1 IP, it updated today to show its using a different IP. So I am not able to login to it via IP too. Although after a firmware update it appears they removed the option to adjust the wifi transmit power so that sucks.

As to my NAT troubles. My Xbox Series X says I have a double NAT and makes my NAT type moderate. I read this is caused by more than 1 device in the network doing NAT. Since my R6400's are set up as AP's I do not believe they are doing NAT correct? The ISP's modem/router/NID thing should be doing the NAT for the network. The ISP's residential gateway, only needed for them tomonitor the network/speeds apparently. Says its ISP protocol is IP_Bridged. I am hoping that means it is acting as a bridge and thus not doing any NAT. But something is affecting NAT on virtually all of my consoles, so I am at a loss