When trying to add a Team Calendar into Google calendar gives "The address that you provided did not contain a calendar in a valid iCal or GData format."

Here the steps I took to reproduce the issue.

1. Create a new events calendar upon Team Calendar
2. Click on the new calendar and click in Subscribe
3. Copy the URL
4. Go to Google Calendar and go other Calendar -> Add it by URL
5. Paste the URL and click on Add Calendar

The issue was created in the plugin project: https://studio.plugins.atlassian.com/browse/TEAMCAL-569