e-Filing error: duplicate attachment form 8822-B

You can try deleting your duplicate Form 8822-B in TurboTax as follows:

To delete a Form 8822-B, you can do the following if you are using TurboTax Desktop:

1. Click on "Forms" at the top right of your TurboTax screen to switch to "Forms Mode"
2. In your left panel search for "Form 8822-B "
3. Click on "Form 8822-B " and it will appear in your right panel
4. At the bottom left of your "Form 8822-B " click on Delete Form
5. A box will appear to confirm the deletion, Select "Yes"

If you are using TurboTax Online you can delete a Form 8822-B as follows:

1. Continue your return
2. Choose "Tax Tools" option on the left menu bar in the federal section of TurboTax
3. Choose "Tools"
4. Under "Other Helpful Links" choose "Delete a form"
5. Find the Form 8822-B and click on the option to delete it

Click here for How Do I View and Delete Forms in TurboTax Online

Click here for "How to Delete Forms in TurboTax Desktop