Thank you for reaching out.
Seems like you are running out of credit from my understanding.
The Azure for Students account provides you with $100 in Azure credits to be used within the first 12 months, plus select free services. Once you exhaust your available credit or reach the end of 12 months, you can upgrade to a pay-as-you-go subscription.
To upgrade your Azure for Students Starter account, follow these step
If you’re eligible, you can upgrade to an Azure free account. You get $200 Azure credit in your billing currency and 12 months of free services on upgrade. If you don’t qualify for a free account, you can upgrade to pay-as-you-go rates with a support request.
Regards,
Oury