Hi @andy
The shared printers are using Type 4 drivers, so the expectation is the connections is created using MS Enhanced Point and Print driver.
Are the drivers published to Windows Update? If they are please set up the GPO "Extend Point and print to search Windows Update".
There was another post here where someone stated they pre-installed the Type 4 drivers on the client systems but Windows would only use this driver when they set the GPO "Limits print driver installation to Administrators" to Disabled.
Thanks