For regulatory reasons, IBKR is required to know where clients are operating from. Frequent logins from different countries can result in additional compliance reviews or requests for explanation. But I guess if they ask and you answer that is fine. That's what I wanted to find out. As a precaution I will let IBKR know beforehand.
I think there's more to this than you're letting on. I'm tax resident in NZ, sometimes I travel and login from different countries. I've never had a problem.
I also travel regularly and have never encountered any issues logging in from different countries. However, I recall reading a post here about an account that was blocked as far as I remember because the holder had shared login with someone in another country or something to that effect. To avoid any misunderstanding, I will notify IBKR in advance that I’ll be trading from a US-based server, just to ensure there are no problems down the line.