Why isn't my credit applying to my aws support bill ( Developer ) ?

Question

I have the active credit ( 100 $) from my account  in navigation panel and it shows some services that it applies to , include AWS Support ( Developer ) . However, when I change support plan ( from Basic to Developer ) , AWS automatically use my debit card . Why don't it charge from Credit ?

Answer

This document describes the general reasons why credits are not applied.  
Do you fall into any of these categories?  
https://repost.aws/knowledge-center/aws-promotional-credit

If this is not the case, you will need to check with AWS Support by creating a case with "Account and billing".

Why isn't my credit applying to my aws support bill ( Developer ) ?

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