Hi @reasler1
As @Chris_Hofer stated, this cannot be done in Canvas, at least not easily. I understand the pedagogical desire to open discussions up between courses or classes, but the only real way to accomplish this is by using third-party tools. There is one work-round you could try with Canvas, and that would be to create a third Canvas classroom with all students enrolled in that class, and then using that classroom just for discussions. A bit of work, and one that would require intervention by your school's Canvas admin - but it dfoes work. We have used that trick extensively to provide a "shared" space for technical/professional program students.
Good luck,
Kelley
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