If you entered the 1098-T, Form 8863 was generated by TurboTax. Delete Form 8863 and if you are not reporting scholarship income, you can delete the 1098-T as well. Then try to e-file again without upgrading. If you already upgraded, you can downgrade back to Free after the education credit form is removed.
How to delete forms in TurboTax Online
How to delete forms in TurboTax Desktop
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