An Azure platform as a service offer that is used to deploy web and cloud applications.
In all likelihood, one of the following applies:
- 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.
Very commonly this results from attempting to use a credit card which has been used in the past to sign up for an Azure subscription
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hth
Marcin