I've had this exact argument: Me: "I'm going to be working from home tomorrow." Them: "What? First I'm hearing of this. We need everyone here tomorrow." Me:

I've had this exact argument: Me: "I'm going to be working from home tomorrow." Them: "What? First I'm hearing of this. We need everyone here tomorrow." Me: "I'm confident that I can do the work from home. I have an obligation that I can't go back on. It's been on my calendar as well." Them: "Not acceptable." Me: "Alright. I'm taking PTO tomorrow." Them: very mad "Fine. Work from home if you can." Ended up winning this one pretty easily considering there were no expectations / limits set on work from home. The just enforced no-work-from-home against people ad hoc.