Calendar - Subscription to Medical & PA Student OASIS Calendar on the iPhone/iPad
Starting from your iOS device, open a browser and go to the OASIS website.
UW SMPH - OASIS https://uw.oasisscheduling.com/
On the schedule page, select the Calendar button.

From the Calendar page, select the Export button.

On the Calendar Export page, under the My Individualized Course Event Calendar section only, select the following:
Calendaring application: Mac/iOS
Number of days to export: 18 weeks
Scroll to bottom of page and click the Save button.

Under the My Individualized Course Event Calendar section only, Copy the newly generated URL.

On your iPhone/iPad device go into the Calendar, paste the calendar URL as a "Subscription Calendar"
Add a subscription calendar on your iPhone or iPad https://support.apple.com/en-us/102301
Your OASIS schedule should now show up as a Subscribed Calendar with in the iOS Calendar app.
Also see:
Subscribe to calendars on Mac https://support.apple.com/guide/calendar/subscribe-to-calendars-icl1022/mac
Import or subscribe to a calendar in Outlook.com or Outlook on the web https://support.microsoft.com/en-us/office/import-or-subscribe-to-a-calendar-in-outlook-com-or-outlook-on-the-web-cff1429c-5af6-41ec-a5b4-74f2c278e98c