App:
Google is currently experiencing an issue with its subscription calendar functionality when importing a calendar for the first time. Please follow the manual import guide below as a temporary workaround.
infoHere's how to manually import a calendar in Google Calendar (online).
Copy the calendar feed
Open Google Calendar in your browser.
In "Other calendars", click the "+" (plus) icon.
In the context menu, click the "Subscribe to calendar" menu.
Select "From URL" in the menu.
Paste in the calendar feed URL from "Step 1" in the "Calendar URL" field.
Click "Add Calendar".