Not really AIBU but more are DDs work being unreasonable. If before you start a new job you give holiday dates and the employer confirms in writing you can have the time off can they then change their mind?
DD asked for Christmas Eve off before she started work by email and her manager emailed back saying yes that's fine.
Where DD works then can check online to see how much holiday they have and DD noticed they hadn't put down she was off Christmas Eve. She mentioned this to her manager who said oh I don't know if you can have it off other staff booked it ages ago. DD said you confirmed it before I started here. Managed said did I? I'll have to check if you can have it off.
Given she confirmed it in writing at the beginning of October surely she can't just turn around and say you can't have it off now.
Are they allowed to do this?