Indeed there is, I started a new FreedomBox by scratch. This fourm Installing GPG keys for Debian Backports | Rolfje’s blog (wordpress.com) gives a great command to use to import the keys. After copying and pasting this line,
sudo gpg --keyserver pgp.mit.edu --recv-keys
7638D0442B90D010 8B48AD6246925553
I was able to then get new packages and “sudo apt update” and “sudo apt upgrade” my RaspberryPi 4. Then I “sudo reboot”
I was met with a beautiful message,
You are running Raspbian GNU/Linux 10 (buster) and FreedomBox version 21.4.2. FreedomBox is up to date.
Nice. Thank ya’ll for solving this a while back, the method is still relevant for new FreedomBoxes with rolling releases.