I had the same problem today (3/15/26) and was finally able to transmit the Federal Return (form 1041) but the California Fiduciary Return (form 541) still fails transmitting with the Error Code 54, even after trying all recommended fixes (installing the TurboTax Business 2025 Super Patch; restarting Windows; clearing the browser cache; etc.). I've got the same problem in both Windows 11 and Windows 10 (where it is still OK to use TT Business 2025). Intuit, is there another possible fix in the works specifically for California Form 541 transmission failures?
