Failed to assign prover

I enabled “proposer” on my taiko node (following guide). But after a while I get errors in log.

WARN [09-26|14:36:27.137] Failed to assign prover endpoint=http://taiko-a5-prover-simple.zkpool.io error=“unsuccessful response 422”

Is there something on my end I am doing wrong?
I tried multiple provers from marketplace, but they all give me this error.

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