I’ve only managed to get it to work once but I think that was because she was already going to be moved to the care home the next day anyway so she accepted. The care workers also will always accept it.
I agree that 25% chance is reasonable but I am convinced it’s bugged since trying repeatedly on one girl for over 20 days she never accepted. The chance they say yes definitely does not increase, from testing it may even be decreasing, hence the reason they never accept. Crazy that you got one of them to take it on your second try.
I have even gotten them to take it in the carehome, then used weight loss medication to get them back out the carehome and then offered it again since I thought once they had had it they would 100% take it again but sadly not. They never accepted again. :(