Hi Frank Allen,
Your Windows 11 Pro purchase is recorded as a digital entitlement linked to your Microsoft Account, meaning you should never be forced to purchase a duplicate license for the same hardware. Since your Dell XPS 8940 and 8950 utilize firmware-embedded keys, the Windows activation engine should automatically prioritize the factory-installed license and then upgrade it based on your digital purchase. If the agent suggested a new purchase, they likely failed to account for the Digital License (Entitlement) that supersedes the base OEM key. You can resolve this by navigating to Settings, System, and then Activation to run the Activation Troubleshooter. Selecting the specific option stating you changed hardware on this device triggers a re-evaluation of the hardware ID against your account history, which usually clears the block without requiring a 25-character key.
The instability you experienced with version 24H2 and the mentioned future builds suggests your devices may be enrolled in the Windows Insider Program, which serves as a testing ground for unrefined code. For the stability required for your radio station operations, you should exit the Insider Program and perform a clean installation using the Media Creation Tool from the official Microsoft software download page. This ensures you are on the General Availability channel, which is the only version validated for production environments. This process will wipe the "preview" bugs and, upon signing in with your Microsoft Account, the system will perform a silent handshake with the activation servers to restore your Pro status automatically.
Hope this answer brings you some helpful information. If it does, please hit "accept answer" to help others in the cummunity.
Domic V.