When can I start working?

I came here in bahrain under visit visa.
I applied in hospital as nurse. I Signed the contract. They applied me for NHRA license which is a long process.
Im done with lmra biometrics.
I have a work visa stamped in my passport.
Im done with medical.
I gave my passport to the HR for application of CPR. On process just today.
Why is it that they are not allowing me to start working?

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