We are also having this error. Lacerte said to check again tomorrow.
This article https://proconnect.intuit.com/community/electronic-filing/help/lacerte-e-file-agency-approval-and-st... lists 2020 Lacerte e-file agency approval and start dates.
As of now, this article shows Texas S-Corp 'Date available' as 'To be determined'
I am experiencing the exact same issue. Everything is good with the return. No critical issues, but getting this error: [etxcode=Go-Live,start=,end=04-30-2021 06:00 AM]
Problem occurred transmitting efile data.
Please reply if anyone has a solution to this problem.