ARN not received even after 15 minutes..

Arn not received 100% profule I have submitted after aadhar authentication and all on 13/03/2021 on 14th trn expired 15days end but arn not received yet now it's 17th now. What to do? And why not received arn

I didn't get arn number yet i registered too but still i didn't get arn number .. can i know the process to get arn number please