Amend Return Transmission Didn't Go Through

over contributed IRA in 2024, withdrew excess contribution, received 1099-R, need to amend 2024. I did the amend, added the document, transmission says successful, but then quickly changes to "Your transmission didn't go through. Any suggestions on how to file return. Currently using the "do it yourself" online version, at this point willing to upgrade to assisted filing, but can't figure that out either... This software is really frustrating.

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