How do I fix this? (See image)

Hello SolidSnake69,

Thank you for using Apple Support Communities!

We understand from your post that you are receiving a message that says, "Cannot Create Account - Your Apple ID cannot be used to created account for other apps." What you are describing sounds like a feature of iOS called Sign in with Apple. This article will provide you with additional information about the requirements to use Sign in with Apple that you may find helpful. Make sure your Apple ID meets all of the requirements below.

How to use Sign in with Apple - Apple Support

"What you need

To sign into an app or website that offers Sign in with Apple, you need: 

• An Apple ID that uses two-factor authentication.
• To be signed in to iCloud with this Apple ID on your Apple device.

Sign in with Apple is available with participating apps on Apple devices with the latest software—iOS 13 or later, iPadOS 13 or later, watchOS 6 or later, macOS Catalina 10.15 or later, and tvOS 13 or later—and with participating websites in Safari. You can also use Sign in with Apple with other web browsers and on other platforms, like Android or Windows.

Sign in with Apple is not available for children under 13 years old. This age may vary by country or region."

Best Regards.