Some bookings sites have access restricted to allow only University of Windsor faculty, staff and students to create bookings. This prevents medical students, who have their Microsoft school account with the University of Western Ontario, from being able to create bookings if they are already signed in with their @uwo.ca account.
To work around this issue, you need to launch a new InPrivate / Incognito window in your browser then copy the URL of the bookings site (for example: https://outlook.office365.com/owa/calendar/StudentHealthBookings@uwindsor.ca/bookings/) and paste it in the address bar of the InPrivate window and press Enter. When asked, please sign in with your UWin Account.
Here are instructions for opening InPrivate / Incognito window depending on the browser that you use: