this answer doesn't address the 2019 TT 630 error code issue.
this advice is irrelevant to this use case.
Intuit has deliberately broken or blocked activation for TY 2019, and therefore bricked your Tax data and your app. A good activation key will always fail, either an app update has broken the app, the activation /url was changed or some other backend handshake problem was installed. the activation server is still operational given other Tax Years still properly activate.
Customer success can't create new keys, their key generator has had TY 2019 removed, They've been given a playbook for how to respond to this issue, which is false and inaccurate. CS will point at the EULA, as justification for this nonsense, the EULA contains no EOL End of Life clause, so Intuit is not in compliance with their own EULA. CS doesn't have access to the 2019 EULA, I do, and will claim the 2023 EULA applies, it doesn't.
The IRS can review your returns for 7 years or more, and Intuit has disabled this TT2019 4 years too early. It's a bad product management decision and should be fixed immediately.
I had to hire a CPA to regenerate my 2019 tax return which is under audit, because of this activation failure.
Don't spend 5 hours trying to reinstall, apply pressure to CS to fix the issue, write notes on the forum and most importantly, escalate the problem with the office of the president., OOP. Your key is likely perfectly fine, Intuit has deliberately broken things in their activation workflow.
