Hi Siamak Behbahani,
To locate your Founders Hub Azure subscription, please sign into the Azure portal using the email address linked to your Founders Hub credits. Navigate to the "Subscriptions" section and check for "Microsoft Azure Sponsorship." If it is not listed, log into the Founders Hub, go to the "Benefits" tab, and redeem the Azure sponsorship. In Azure, under "Subscriptions," select "Add," choose "All other offers," and check your eligibility for "Microsoft Azure Sponsorship." If you see the message "This account doesn't have an active Sponsorship," it may mean your account is inactive or not linked correctly. Please ensure you are using the correct email address and have completed all necessary verification steps in the Founders Hub.
For reference, I activated my Azure sponsorship. How can I create subscriptions to use my sponsorship credits?