Email at the app store differnt to Apple ID

Re: My Apple ID email if Different from the App Store email, how do I change it at the app store?

You may have changed the e-address sometime you were still logged in to the App Store.

Try logging out of the App Store that has the old e-address, and then logging back in using the correct email ID.

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Else, if you still need help:

You could try checking which eMail address is in use in your Apple Account online:

(This is the one account used for everything Apple, including the App store.)

Log-in webpage: https://account.apple.com/

If needed: See how to :Change your Apple Account primary email address - Apple Support

(Changes may take 24 hours to update everywhere used.)

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Still not solved ?

Another place to check is that you are signed in (to your iPhone) with the correct eMail address

See how to: Sign in to your Apple Account - Apple Support