Nonemployee Compensation

I work at a Bank which has a partner company. I do work for the partner company but receive compensation through my employer only. I got a Christmas Bonus from the partner company for helping out and so I received a 1099-NEC with the amount in Box 1. I wouldn't file this as self-employment right? And I'm not technically an employee there. So should it have been reported on a W-2? I'm not sure what type of income to label it as out of the listed options. Thank you!