Additional features, settings, or issues not covered by specific Microsoft Teams categories
Hello Melanie,
From your description, may I understand that you'd like to request time off in Teams? If not, please feel free to correct me. If I'm right, you can use Shifts app to do that. For more detailed instructions, here is an article for your reference: Time off and availability in Shifts.
If you need further assistance, welcome back to contact me.
Regards,
Seven