Hi @Varsha GR,
Thank you for reaching out. To resolve the issue with upgrading your Azure for Students account to Pay-As-You-Go, please ensure your account is eligible for the upgrade. Double-check that you've followed the steps correctly in the Azure portal by navigating to Subscriptions, selecting your disabled subscription, and looking for the Upgrade option. If you encountered an error during the payment or verification step, ensure your payment details and phone number are correct.
If the issue persists or the upgrade option is unavailable, please submit a support request through the Azure portal under Help + Support and providing the error details.
Thank you.