I would need to check (not in charge of it), but I do remember in the fat stack of guidelines we got there was the password policy of 90 days. However, the point still stands that some people have no digital hygiene and will write down and share their passwords in plain text for all to see even if we didn’t enforce password expiry. Though in all honesty, there’s no winning combination when so many don’t truly give a shit about digital security. As long as they can flaunt a certificate.
It’s somehow always the guys in management/on top. On the first sign of inconvenience, they start complaining about all the security measures, because now it affects them personally, and they’re not here to be managed! Security is for everyone else, but definitely not them. They’re above it.