I found some old threads but nothing I could get working today. My automated readarr setup would greatly benefit from ABB access. Which I used to have not long ago but now seems to be blocked. Not everything is on MAM, unfortunately.
Got the fork of prowlarr you recommended up and running but getting a timeout on adding ABB. Will try again later. For now, it is working in jackett again so that is a good temp solution. I will ideally have both running so there is a backup if one goes down later.