In brief, someone promised to send me something by the end of last week. I sent a (polite) reminder email on Friday and got a reply from their boss to say this person was out of the office all day getting their vaccination. I know some people have had to travel longish distances and queue for ages to get their jab, but do you really need to take a whole day off?
I should add, today is Wednesday and they still haven't sent what they promised.