Working from home is a benefit that is worth money. People are willing to get paid less for the benefit of working from home all else equal. Effectively, if you got to work from home, you got a raise. Forcing people to come back to the office after allowing working from home is like giving a raise and then taking it back.

However, when you negotiated your pay it was for a particular job with certain benefits. Complaining about your company not giving you a benefit that wasn’t initially part of your hiring negotiation is basically asking for a raise that they aren’t obligated to provide.