DA problem

[Kent]

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I recently replaced a DLE 120 with a refurbished DA150 in my CARF 2.6m Edge 540.
I flew it once last weekend after some problems with a broken woodruff key. The key was replaced.
The engine ran great so I happily went home.
Next day I tested a spare ignition. I didn't start. Connected the original ignition again. It didn't even popped.
Checked the spark, OK. Batteries OK. Carburettor OK. Fuel lines OK.
Frustrated I stored the plane in a dark place in the garage for a day or so.
Now I try to figure out what will be the next move.
Maybe you can help me. 🥹🥹