So I did a quick search and found this where someone had a similar issue. Besides the antibacterial ointment it said you can also use coconut oil.
https://www.backyardchickens.com/threads/help-chick-hatch-assist-gone-awry.814028/#post-11809945
good luck!
I’m not sure, but over on this thread I’ll post in a minute, several people put medicated ointment (without pain reliever!) on the membrane to keep it alive.