Desktop forces Sign In but won't accept it

TurboTax Desktop 2024 forces "Sign In", but it doesn't accept it. (My Sign-in info is correct, because it works on the website, just not on the Desktop program.) Requesting it to Text to my phone gets the phone code, but still doesn't get through the Sign-in step. I have correctly "Updated" this Desktop software a couple times, so it *was* working. But now the "Sign In" is in an infinite loop of not getting Signed In.