First, Surface Pens do not need to be paired via Bluetooth to write. This pen definitely works with my SP7+.
You mention these are imaged from the domain. Your custom image may not contain the necessary Surface specific drivers. Try running the appropriate MSI from Download Surface Pro 7+ Drivers and Firmware from Official Microsoft Download Center on one of these devices (there is one for Windows 10 and on for Windows 11). If this fails to resolve the issue, go to https://www.microsoft.com/en-us/download/details.aspx?id=46703 and download
Surface_Diagnostic_Toolkit_for_Business. You can run this in desktop mode and run all or selective tests. See https://docs.microsoft.com/en-us/surface/surface-diagnostic-toolkit-desktop-mode.
Let us know results.