github: how to reference an issue in a commit from a different repository?

I have two repositories:

• Repository A
• Repository B

I also have a project:

• Project X

This Project X has Repository A and Repository B as linked repositories.

In Repository A I created several issues:

• Issue 1
• Issue 2
• Issue 3

All these issues are appearing on the kanban board of Project X. When I now do a commit on Repository B:

closes #1

The commit wont get linked to the Issue 1 of Repository A. Can I configure the project in a way that I can create such references from commits from different Repositories? Or do I use this wrong?