First, please feel free to check out the given AI answer
I’m sorry this happened. Since the Find My Device page is returning “Error” for both Find and Lock, I would first check whether the stolen laptop is still communicating with your Microsoft account.
Please go to account.microsoft.com/devices and verify that the laptop is still listed there. If it is listed, check its last activity/device information and note the serial number for your police report.
Because the laptop was stolen, I also recommend changing your Microsoft account password and using Sign out everywhere to invalidate existing sessions. Please note that signing out everywhere can take up to 24 hours.
If the laptop never comes back online, Microsoft’s Find My Device service will not be able to obtain a new location or apply a remote lock.
You can also contact Microsoft Support if the device remains listed but the Find/Lock actions consistently fail.
Please note that this is a user-to-user support forum. Moderators and contributors cannot access accounts or Microsoft’s back-end systems. We can only provide technical guidance on reported incidents, requests and ideas
Thank you for your understanding and hope you have a good day