In the test environment (2 IIS web servers, 1 SQL server, 1 IIS Utility server) none of our DB-driven apps are working. We cannot figure out the issue, but we think that MDAC is hosed.

I know you can install Windows 11 for ARM in Parallels and then run Visual Studio and SQL Server on top of that (with ARM-x64 emulation, I guess?), but IIS support was missing last I checked.