In 2024 tax season, I had the same error, but found all online support suggestions were incorrect.
1) The source of the error was "0" being entered into the online form fields, rather than leaving the fields blank. To be clear, clearing the fields of any entry solves the issue.
Further issues that were not part of the solution:
2) Downloading the Desktop version must be Delux or higher version. Basic will not download a return from the web.
3) Editing the form in the Desktop version did not resolve the issue "AMT dep allowed/allowable is too large".
