CM 871 Code 2639, DPF won't clean

[Doops22]

So I pressure tested the coolant system and no coolant or wetness at the egr outlet so I put it back together. I had the DPF and DOC cleaned and baked. Completed the egr tuneup with a new egr delta P sensor. Still have code 2639 active and the DPF light on the dash. I took it for a drive and the light went out for a mile or 2 but came back on. I found in my code scanner where I can see DPF delta P and it shows Peak Soot Filter Delta P 0.74 PSI. The filters were cleaned and baked so I know it isn’t plugged, any other ideas to clear this code and light?!