Fixing my Overdrive

I’m out of ideas, and I’m ready to pull together the panel of elders. This overdrive transmission was a replacement, and I thoroughly cleaned it, new solenoid, correct fluids, cleaned screens and all the other goodness. Wiring is known good. It worked for about a minute, and quit. No noises, no metal shavings. Just won’t engage. Now what. So I need some help to diagnose and fix this issue

Virginia