I am not able to sign-in to App Store or TestFlight with my Apple ID. How can I fix it?

Please follow the following steps to sign-in to App Store or TestFlight if you have Apple’s Two-factor authentication enabled for your Apple ID.
    • Step 1

      Open the App Store & Click on the Blue User icon on the top right corner of the App Store Home Page.

    • Step 2

      Enter your Apple ID and Password.

    • Step 3

      Enter the verification code when prompted and complete the sign-in.

    • Step 4

      Once signed-in, you can search for and install your desired app on the App Store.

    • Step 5

      OR open the Testflight App, and click ‘Continue’ to view and test your iOS Apps.