My transmission didn't go through bc they're not available?

Upon attempting to e-file my taxes, after showing a check mark animation, it sends me to a screen claiming "Your transmission didn't go through. We could not e-file your return for the following reason: Tax Year 2021 transmissions are not available."  I've never had this issue before, what's the point of going through TurboTax if it won't let me e-file this way?  Is this a common problem?