You may want to schedule an appointment manually, at a time you're not typically available. Follow the steps below to schedule outside your default availability.
NOTE: in the Teams Calendars this is only an option if you're an assigned user within the specific calendar.
Step 1: Accessing the Calendar
Navigate to Scheduling > Calendar
Choose the calendar this appointment is for, using the dropdown menu at the top left.
Step 2: Creating the Appointment
Click into date/time you wish to schedule the appointment for, even if it is outside of normal availability.
In the pop-up window, type in the name of the contact, and select their name from the dropdown. Don't add any other information (such as email address or phone number).
The rest of their information will automatically pull from their contact record.
Scroll down and click "Save" to confirm your changes.
Your appointment will now appear.