"Your Apple ID cannot be used to create accounts for other apps" message.

I have now found the answer to my issue - Signing in with Apple ID is not available for children under the age of 13.

As it says here (under 'Learn More') https://support.apple.com/en-gb/HT210318

Which took a while to find out!

I know, it’s so annoying. It’s because you may be under the age of 13, or your already signed in on another device with the same Apple ID on Among Us. I have the first problem, which is I’m under 13. If you’re also a child and your mom or dad has an apple device, you can ask to play Among Us on their device. If you’re over 13, try remembering the last device you were logged on Among Us with your Apple ID and sign out of it on that device. I really wish Innersloth changed their account system as well, I feel you man. But hopefully this helped. (And sorry this is late as well)

You can't sign into apps using your Apple ID if the app doesn't support that feature. That is a problem the app developer has to fix, not Apple.

Dudes have you looked at any of the above conversations? It’s because you are 13 and under.

https://support.apple.com/en-gb/HT210318 It may be because you are under the age of 13.

If he is 13 years old or younger, then that is why he cannot login.

Apple doesn’t routinely monitor the discussions. These are mostly user to user discussions.

If you want to, you can send Apple feedback. They won't answer, but at least will know there is a problem or a suggestion for change. If enough people send feedback, it may get the problem/suggested change solved sooner. Pick the closest topic you can find.

Click here to send Feedback          

My kids have this problem too, with the new Among Us update, but one child can use their Apple ID to sign in and the other one can't. Very odd and I can't see a way around it.

No it’s not. I have the same problem with Among Us as well as other games.

How to change that feature though

Yea but when you set your age in over 13 it should work, plus my brother has done it and he’s under

The app allows amount login using Apple ID. I logged in from my iPhone using my Apple ID. My son couldn’t! The app says good account can’t be used to login. May be because he a minor?

Among us on mobile has been very frustrating and I am jealous of my little brother on my dads account with free chat. To Innersloth, please change this. Mine also says, Apple ID cannot be used to create an account.

So I don’t understand why I’m not allowed to create it just for age reasons????

I don’t know, I am sorry it’s just a dumb setting that Apple has.