Job schedules colliding

I have two jobs, one of which I started a couple of weeks ago and before that I told my manager at my first job I can only work two m specific days during the week. My manager scheduled me outside my availability for my older job and now my schedules collide. I had to miss work about 3 weeks ago due to health reasons so I don’t really wanna call out but I also don’t wanna miss my new job and give them a bad view on my attendance. I put in my two weeks about a week ago for my older job.

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