Hello Anjali Gopi,
To resolve this issue, double-check whether the following items are true:
- The information that you provided for your Azure account profile (including contact email address, street address, and telephone number) is correct.
- The credit card information is correct.
- You don't already have a Microsoft account that uses the same information.
You can also create a billing support ticket: open a support request.
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola