If you are receiving an error "Cannot Create Account - An identical Subscribed Calendar account already exists.", here are the steps you need to unsubscribe from the calendar that is currently setup.

How to unsubscribe on iPhone (iOS 10)

• Tap Settings
• Tap Calendar (in earlier iOS versions tap Mail, Contacts, Calendars)
• Tap Accounts
• Tap Subscribed Calendars
• Tap the "TeamSideline Calendar" to remove it
• Tap Delete Account
• Tap Delete Account to confirm

How to unsubscribe on iPhone (iOS 11&12)

• Tap Settings
• Tap Passwords & Accounts
• Tap Subscribed Calendars
• Tap the "TeamSideline Calendar" to remove it
• Tap Delete Account
• Tap Delete Account to confirm

How to unsubscribe on Google Calendar

• Open Google Calendar
• In the top right, click the Settings icon then click Settings
• Click the Calendars tab
• Click the Unsubscribe link to the right of the "TeamSideline Calendar" calendar you wish to remove.

How to unsubscribe on iPhone 7 (iOS 10)

• Go to Settings>Calendar>Accounts
• Tap Subscribed Calendars
• Tap TeamSideline and then tap delete.