I am getting the same error message for NJ tax returns. Previous agent indicated it may be a payment forms issue however I beginning to doubt it. Both returns are generating refunds but one is pay-by-refund and the other has been paid by invoice. Both has this as a critical issue and will not allow e-filing.

Message: E-file Transmission Failure

Tax Year 2025 transmissions are not available. ProConnect Tax Online is not ready to process Tax Year 2025 for this return. Problem occurred transmitting efile data.