error message saying cannot allow app tracking

Tough transition. I remember wondering why when I turned 18 and still had a few months of highschool left, I couldn't sign my own absence notes. :-)

If you're truly desperate

Update the birth date associated with your Apple ID - Apple Support

If an app asks to track your activity - Apple Support

In some circumstances, the “Allow Apps to Request to Track” setting is disabled, including:

"For users with child accounts or under age 18 by birth year, signed in with their Apple ID" - if Apple truly means what that says then I guess it is possible you could have just turned 18 but by year the system thinks you're still 17.

See other possible reasons listed in the article.

I did do that, but it is still greyed out