(2023 Tax Year) Hmm... it looks like we've hit a slight snag

I have completed my return on TurboTax Home and Business 2023. I am able to sign in to my TurboTax/Intuit account. But, I am NOT able to go through the payment workflow for e-filing or adding the free audit defense. I already went through all the existing support posts, including ones from previous tax years, but I have not had success fixing this issue. I also have spent over an hour with a Support Tech walking through all the same steps together with screen sharing, but we were unable to fix the issue. The only "solutions" I was provided was to file an extension, hope the technical issue on TurboTax's side is fixed by October 2024, and if it is not, file by mail (but then I wouldn't be able to sign up for Audit Defense). I want to e-file or I would not buy this software in the first place.

Here are the specifics on the error:

I stepped through all the pages in the return, confirmed no errors, but I get this error message:

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