Alcohol at the wheel and MPU

Servus, Hab mal ne Frag. A well-known from Poland who also has its headquarters there, currently lives in Germany because he works here. He made a big stupid mistake and drove with about 1.8 promille and was caught by the police. He also regrets this very much and is currently quite finished with the world and even plays with suicidal thoughts. He was deprived of the Polish EU driving licence and got a driving ban for 9 months here in Germany. He has recently picked up his driver’s license in Poland again and is allowed to drive there. Now he has received a letter from the city here in Germany that he has to go to MPU before he is allowed to drive in Germany. I have to ask myself now he has to go to MPU as a Polish citizen and can he really give Germany a driving ban here? After all, he got his Polish EU driver’s license again. he doesn’t make an MPU. As I heard, the city believes that his main residence is here in Germany, his headquarters are in Poland and he is Polish citizen. In the letter from the city he was supposed to apply for his driver’s license at the admission office in xy… but he already has his driver’s license back!! Can someone further help us don’t know any more. Money for a lawyer is no longer there. mfg Michi