What should I do if a hospital recruits nurses without a letter of consent from the original unit?

If the unit does not issue a certificate of consent to apply, then according to the regulations, you cannot register for reference. You can communicate with the unit leader. If it still doesn't work, then you have to give up.

You can also communicate with the recruitment department and issue this certificate after the interview. This is possible in some places. You can coordinate with the recruitment department first. If it is possible, of course it is good. If not, then you have to go to the unit to recruit the leader. If he does not issue you a certificate, it means that the unit does not agree with your application. In this case, you It's just about developing a "personal relationship" between you and your leader. If the unit does not agree, the leader can agree. It's just a matter of stamping it.