LTI 1.3 setting up the course

Hi All,
We are trying to set up the LTI-consumer xblock in our courses on Lilac.
We are using the Microsoft Learn LTI Application and LTI 1.3.
It was successfully deployed and set up in the course and in the tool, but how to link the unit with the course on the other platform?
Now it shows the frame with the tool title followed by “This assignment is not yet Published”.
Thank you in advance!