Dear @Mahamed,
did you find an answer on your question already? Just in case that you or someone else on the platform are still looking for information about your question, i will link this thread where the same topic was already discussed on the Wefugees Platform:
https://***.wefugees.de/805487/kindergeld-for-my-son-has-been-denied-for-the-last-8-months
Please don´t hesitate to reach out to the Wefugees Community again if you have further questions!
All the best!