Just added a HDFX-4K and the "record button is missing"

Also I noticed the channels only show up on the AppleTV but not on the DVR. I'm using RP4 with the following: 2021.1101.2046 and 2022.3.22.1901

On the DVR web UI you need to assign guide data to the new HDHR, under Settings > Sources

Oh crap I wasn't hitting the green "save" button.. after entering my zip, thanks!