Hello David @ David Lambert
Following are few possible solutions you can try :
1. Reset network settings: you can go to Start menu > Settings > Network and Internet > Status > Network Reset. Make sure two PCs are connecting to the same subnet. And they can ping each other successfully.
2. Check the account permissions: Ensure that the user account you are using to access the shared folder on tablet has the necessary permissions.
3. Temporarily disable the firewall on both the Windows 10 Pro tablet and Windows 11 Pro laptop to check if the firewall settings are blocking the access.
4. Also make sure both PC are running the latest updates , restart both.