TRP Hy/Rd Bleed Problem

in Workshop
So, I tried bleeding my Hy/Rd caliper last night for the first time after 3 years of use. I followed the official video guide exactly as advised...

All seemed to be going well, but now the lever pulls all the way to the bars and the pistons refuse to move. There is no resistance at the lever. The fluid was flowing out freely, clear with no bubbles. I bled them a second time this morning but no difference.
Any ideas?

All seemed to be going well, but now the lever pulls all the way to the bars and the pistons refuse to move. There is no resistance at the lever. The fluid was flowing out freely, clear with no bubbles. I bled them a second time this morning but no difference.
Any ideas?
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If that doesn't work I'm going to admit defeat and downgrade to the mechanical TRP Spyre. This is for my commuter which needs to be reliable all year round.
Zip tie the good one in so the stuck one should start to move when you pull the lever (path of least resistance). Get some cotton buds to clean around the edges of the piston when it moves out. Should be OK after that.