I noticed today that the deadname of a client was clearly visible in their client file because it was their legal name, and flagged it for IT. I specifically flagged it as "Hey, if someone sees this and calls our client the wrong name, we'll lose them as a client." IT emailed me back immediately, and it's now invisible except on their contract with us, which the majority of us don't have direct access to, as opposed to their client file.
The reason I flagged it framing it as a loss is that what matters to most companies is money. If you can flag a bigoted practice as something that will lose customers, clients, or get them a lawsuit, that is significantly more likely to get taken care of quickly than trying to appeal to their better nature. I could have flagged it as "Hey, this is going to make our client really upset if they hear it.", which was my actual motivation for flagging it, but if I had, then it probably would have been taken care of in a few days or even weeks, not hours.
Always hit them with the profit argument for quick and decisive action.