Hi Jez Williams,
Regarding transferring your Windows Pro license to your replacement laptop, the activation method depends entirely on how the original Pro edition was acquired. If your company purchased the laptop with Windows Pro preinstalled by the OEM, that license is embedded in the hardware firmware of the returned device and cannot be transferred to the new one. In this specific scenario, you should reach out to your corporate IT administrator or the equipment supplier to verify the licensing entitlement bundled with your new replacement unit.
If you manually upgraded the original laptop using a retail digital license or a Microsoft 365 Business subscription tied to your work account, you can easily reactivate it on the new machine. First, ensure you sign in with the exact same Microsoft or corporate account on the replacement device, then navigate to Settings, select System, and click Activation. If the system does not activate automatically, you can run the built-in Activation Troubleshooter from that same menu and select the option indicating you recently changed hardware on this device to pull the digital entitlement from your account history.
If these steps help restore your Windows Pro status, please accept this answer to help other community members facing similar issues.
Tracy.