Being instructed to do something that I don’t agree with. That I think may have legal ramifications. And possibly personal safety ones (which is probably unlikely but we live in a crazy world these days and one always has to be cognizant of that fact.)
Waiting for the said instructions in writing. Not that I believe that “fixes” any of my concerns. But, at least, I can prove I was told by my boss what I had to do should anything come of it.