WINDOWS 11 - problems connecting to WDM driver COM port

Question

I have a minifilter WDM driver that works on Windows 7 and Windows 10 .
But when i try to connect to it from the user mode application via the function call: FilterConnectCommunicationPort
I get the following error:
err. code: 800705aa
err. message: "Insufficient system resources exist to complete the requested service."

I have seen via the debugger that the driver actually manages to create/open the port.
The name of the port used in the driver and in the application match.

I need some clues to find which direction to debug this.
I checked the code and it is almost identical to the example:
https://github.com/microsoft/Windows-driver-samples/tree/main/filesys/miniFilter/minispy

from what i see by reviewing the code, it should work.
What am i missing ?