No, there is no impediment to Quebec, or any other province or territory, in participating in CRTC processes. The way it works is that the CRTC will usually put up a notice of consultation, which basically sets out the questions on which it's consulting. It's open to any interested stakeholder or any territorial or provincial government that wishes to participate. They are more than welcome to do so.
On September 23rd, 2024. See this statement in context.