Copilot for Microsoft 365 AMA: Tech Accelerator edition (Day 2)

Q1: We are getting different results from M365 Chat on Office.com / M365 Chat on Teams / Copilot in the Edge / Win 11 task bar . Is there difference between all these input points for Copilot ? If so, is there any documentation that can explain where and how each process / respond to data ? Q2: we have some user where responses from M365 Chat on Office.com vs Copilot fot 365 on Win11 task bar/Edge "Work" bar are the same but with some other users, M365 Chat on Office.com does not provide correct responses, even no response at all Q3 : Is Advanced Residency option available for the Canadian Geo so that the LLM is hosted in CA as well ?