I have an all Ubiquiti setup and only use local accounts for everything. UDM Pro, 2 8 port switches and 2 APs, U6Mesh and another older AP. One of my accounts had me turn on MFA but every device still let’s me use a local account with a password and ssh key. Do you know what devices are forcing that?
I use Kavita since I don’t get audiobooks and found out about it before ABS. I convert amazon bought ebooks to epub using calibre and put them on my unraid server to get picked up by kavita. Any epub can be emailed from kavita to my device.