I cannot open any version of Lacerte on 2 out of 7 computers on my network! Beyond frustrated. Lacerte support says they have exhausted all of their troubleshooting with me. My IT person has done it all including reinstalling the operating system.

On Friday one computer installed the 2025 Lacerte from the network taxsetup.exe. She had 2024 open and had been using it. After she installed the 2025 and went to open it she received this message - We are unable to sign you in. There may be an issue with your system configuration. For more help, contact customer support and reference code 25625. I uninstalled & reinstalled, cleared cache, emptied temp folder & app data folder. After restarting PC 2024 would also not open. 2023 would not open. Ended up calling support. We worked on it. While I worked with support my coworker logged into another computer and was able to open 2024. 2025 had not been installed on that PC yet. All the while this is going on 5 other coworkers were working in 2025 with no problem. I then decided to open 2022 thinking the auto logging may be causing an issue. 2022 opened then I was able to open 2025. Problem "fixed" case closed. Monday I went to install 2025 on the other PC and got the same message and now 2024, 2023 and 2022 will not open. I also have one other PC that was working doing the same thing. I worked 2 more days with Lacerte support when they said it was an IT issue. I called in an IT person and he couldn't get passed the message after again uninstalling/reinstalling then he did the following-1) Removed the network providers security filtering 2)eliminated the network providers DNS and routed through Google and cloudfare 3)removed 3rd party security suite 4)white listed the app in the default windows firewall 5)white listed the domain & IP for pf.intuit.com 6)switched the default browser in the event the system uses web based authentication 7)uninstalled AVG security 8)re-loaded the operating system 9) ensured the operating system, drivers, and firmware are on the latest firmware. All while doing this 5 other PCs are not impacted. All of these PCs are running Windows 11and are brand new. I set them up in December. I need help please!!