Please check the following:
- 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.
Also see:
If the aboved oes not fix, I would recommend you either attempt a different card/ reach out to support.
Connect with @AzureSupport on Twitter
OR
Call global customer service - https://support.microsoft.com/en-gb/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2 to raise a support request on your behalf to help you connect with Azure billing and subscription management support.
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola