I work at a grocery store, which isn't bad for the most part. I've been here for over a year. On Saturday the 8th I texted my manager that I wasn't gonna be there next Sunday, the 15th, and even offered to work the 14th instead, so I could still get hours and it would be easier for her to switch people around. I'm technically supposed to notify management 20 days out for a planned absence, but I've texted my manager in the under-20-day window before and it has never been a problem. But when I came in today, my manager let me know that next time I call out, I will have to find someone to cover for me. Isn't that her job? I only have two people's phone numbers, which is about 10% of the people that I work with. And I work two days a week, so it's hard to ask my coworkers in person. But isn't that her job? She has everyone's phone number, and I have been asked to cover other's shifts by her. If I'm in the wrong please let me know respectfully, because I am genuinely wondering. Thanks.