In your case, since you tried numerous options and can't transmit your returns, I would agree with you that it must be the crypto transactions.
Definitely I would recommend using the Summary method to report. Doesn't matter how many 'brokers' you have. Very little data entry!
You could try to Contact TurboTax Help or Expert Support but since this is not affecting a great number of users, may not get fixed anytime soon.
Click this link for more info on How is Crypto Taxed?
@Tylert416
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