He’s just busy. TBH I find it really hard to juggle things when I have (at any given time) Teams messages, Teams calls, phone calls, emails, meetings etc etc. And if I’ve got a zillion things to do and there’s a Teams message that maybe needs a bit more of a thoughtful reply, I won’t always respond straight away. I can sometimes sense people waiting for me to reply - I’m not ignoring anyone and it’s not the end of the world, but I’ve got too many things to do at once.