[r_hoods_ghost]

Have you tried calling them on an actual phone (not Teams, Slack etc.) instead of emailing or messaging? Or reaching out to one of their direct reports and asking what the best way of getting hold of them is? If you're a new hire in a large company, do the people you are trying to contact know who you are already or are you "cold calling / emailing" them? Have you introduced yourself? This was easier in the before times when you could stick your head round theor door. I know several seniors who screen their emails to the extent that if you're not on their mental list, or have a rule that allows you to bypass their mail filter, then you're not getting a response. Hell I've done this myself sometimes. Executives, and seniors generally, rarely pay any attention to Teams Messages or other sorts of IMs as their time and attention is in short supply.