Hey it seems to me that if you have ASTAP configured as your main solver, Astrometry.NET won’t solve either in a blind fail over OR as Solve and Sync Blind.
While waiting for SGP/Astrometry.NET to complete I was able to load the same fits file to nova.astrometry.net and get a successful solve, so aborted the SGP solve.
Was not able to get any successful blind solve until I went back to PlateSovle2 as the main solver and then things returned to normal.
I had seen another post here (which I can’t find now) about blind failover not working with ASTAP, and I wanted to add that it isn’t just the fail over that not working. It’s the blind solver in general.