When you get the message "Contribution to IRA not deductible due to MAGI being too high" then this means that your traditional IRA contributions are automatically nondeductible and TurboTax will create Form 8606 and add your nondeductible contribution on line 1.
To confirm, are you using TurboTax Desktop? Do you see Form 8606 after entering the nondeductible IRA contribution when you switch to form mode?
Please see How do I enter a backdoor Roth IRA conversion? for additional information.
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