HI, your employer needs to create Team Management and Permissions for the employees, on the EMPLOYER account. Your account has nothing to do with your employer or the event.
Hopefully these Square Support pages will help.
https://squareup.com/help/us/en/article/5591-get-started-with-employee-management
https://squareup.com/help/us/en/article/5822-employee-permissions
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