AZ-400 Voucher for exam

Hello rahul_ranjan ,
currently there is no way to take the AZ-400 exam for free, but you might be interested in "Microsoft Cloud Skills Challenge - 30 Days to Learn It" which is offered until June 30th, 2023.
Basically you go through the Microsoft Learn content for the exam you want to take, in your case it would be "DevOps Engineer" for the AZ-400 and get a 50% discount on it, I know it's not free, but it's better than nothing.

You can find more information about it here:

1. https://developer.microsoft.com/en-us/offers/30-days-to-learn-it
2. https://developer.microsoft.com/en-US/offers/30-days-to-learn-it/official-rules

And as Julian_Sharp said, please don't use dumps to prepare for your exams, aside from the fact that this is considered cheating, you ruin the whole point of a certification when doing this.

I hope I could help you 🙂