2019 software isn't supported by TTX anymore....and it "appears" that they (TurboTax) shut down their code acceptance system for 2019 now too.
Others in this Forum, with the various personal tax editions, have noted the same problem for just 2019 (the first year TTX required the installation code).
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Thus, if you are still using "Business" on an older desktop or laptop...continue to use it there and make sure you get PDFs created regularly and backed up to a flash drive for future reference.
If you used desktop 2020, 2021, 2022 Those would still work OK so get them installed asap. I got a new laptop last week, and my 2020,21, 22 Premier all installed ok...but 2019 did generate an error 630.
You might be able to install 2018 and earlier too, since no installation codes were required back then BUT...neither updates, nor states would be available for those years.
Thank you for your answer. But shouldn't Turbo Tax give us a fix for that? I don't have the 2019 software installed any place except on the laptop that doesn't work any longer. I will try to contact them.