Replaced caliper and after bleeding the ABS system the brake pedal goes to the floor?

I just watched your video on YouTube “How to bleed an ABS system- step by step”. I replaced the front calipers and I know that mistakenly, air somehow got into the Master Cylinder. After bleeding the Master Cylinder twice and the rest of the brake system afterwards (twice), I get no air bubbles and the pedal gets firm as it should. However, when I turn on the engine, the pedal goes to the floor. I have no ABS lights on or any other warning lights. I can get the pedal to firm up while engine is running by pumping it up, but when I let off the pedal completely, it goes back to being spongy.

My question is, could there be air in the ABS module and if so, would there be a warning light? I do not have a scanner tool. I have tried to take it to a service shop here that does brakes, a chain place called Mavis Tire and Brakes, however, I was too honest apparently (simply told them I did the caliper replacements, didn’t mention losing a lot of brake fluid), but they told me that they basically would not “work behind someone else”. This was really frustrating considering that’s usually the purpose of service shops, to fix what normal folks don’t know how to do.

Anyway, any help would be appreciated.