If you got the message that it is nondeductible because of your income limits and a retirement plan at work then you have the first step done correctly. You should have a basis on line 1 of Form 8606.
To confirm, you entered the step 2, Form 1099-R for the conversion but line 4b show the amount as taxable? Please see How do I enter a backdoor Roth IRA conversion? for detailed instructions.
Did you have any pre-tax funds in your traditional/SEP/SIMPLE IRAs on December 31, 2023? If yes then the pro-rata rule applies. This means that with each distribution/ conversion you will have a taxable and nontaxable part.
The Backdoor Roth only works if your traditional/SEP/SIMPLE IRAs are empty. If you have pre-tax funds in your traditional/SEP/SIMPLE IRAs then you might want to think about a reverse rollover where you rollover IRA money to a company plan, like a 401(k). Only pre-tax funds can be rolled from an IRA to a company plan. Therefore, you would isolate the basis and could start the Backdoor Roth procedure fresh. But it only works if your employer allows it, not all plans do.
If this doesn't solve your issue then please provide more details about your situation.
@lndwalton
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