The ruling on wages for a specialization added by mistake

Question:
May Allah reward you with good and do you well. A message was sent by one of the brothers. He says: Your brother in Allah, Maimun, from the Arab Republic of Egypt, working in the Kingdom. He says: I am a young graduate of one of the departments of the College of Science. When I received my graduation certificate, another specialization was added to my field by mistake. It so happened that I applied for a competition to fill a position in this specialization, after having taken several courses in it. I passed the exam successfully, and it was agreed that I would work in both specializations. During my previous period of work, I received an excellent rating in this specialization from my supervisors. Please inform me whether the wages I receive for that are lawful or forbidden, and if they are forbidden, what should I do with what I have taken in the previous years? May Allah reward you with good?

Answer:
The criterion is performing the work as required. If you have performed this work as required, then there is no blame on you regarding the money you took, because the money is in exchange for the work, and you performed the work as required. However, from the administrative and job-related perspective, you must inform the authorities about this situation so that they can apply the necessary regulations. You must tell them the truth so that they can apply the required system in such matters. Yes.