Hello Abhi,
Thanks for your question.
Azure credits can be applied toward any Azure product listed here. Azure credits can't be used for non-Azure products, products purchased through Microsoft Azure Marketplace, or Microsoft Support Plans. See:
These are the support options available.
Standard support is an add-on not a standard azure service hence why it is not covered.
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola