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Same DXC AC as above (honest :-) )

I was with them when the WFH ban came in, my team was spread around the country, with only a couple of people coming to my office perhaps 2 or 3 days a week at most, due to travel restrictions. (They officially worked out of their own local offices on the other days, they were only at mine for workshops etc).

I didn't work with any other people in the building, and I always knew exactly when the other team members were going to be in (we had a team calendar). Which was always Tues, Wed or Thur, never Monday or Friday. Plus it was a secure account, no one else allowed in the room but us.

So for about two years I worked from home every Monday and Friday, and either no one noticed, or no one cared, as no one ever said anything! :-D