Companies must tag one of their posted roles to make an intro call request. However, they might want to reach out to you about a role they don't have posted on Triplebyte. They also might feel you're a great fit for their company - perhaps they work in one of your preferred domains or you have a specific skillset they're looking for. Your best bet is to get on the phone with them and find out.
If you have additional questions, please contact FastTrack Support.