Hello Gopal Kumawat,
Thanks for your question.
Check if these credits have been redeemed firstly. Also ensure you're using the correct Azure subscription associated with your sponsor credits. https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/filter-view-subscriptions
Also See:
https://azure.microsoft.com/en-us/pricing/offers/ms-azr-0036p
If this does not reso;ve, I will suggest you reach out to the billing support team:
https://azure.microsoft.com/en-us/support/create-ticket
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola