FRITZ!Powerline 546E Service - Knowledge Base

FRITZ!Powerline 546E Service

Error message: "Authentication error occurred." when using Google calendar

The error message "Authentication error occurred." is displayed for the Google calendar in the profile of your smart home device on the tab "Switch Automatically" in the user interface of FRITZ!Powerline.


  • FRITZ!Powerline's access rights to the calendar were revoked in the Google account.

1 Deleting a calendar

In order to request access rights for the calendar again, you must first delete all of the Google calendars in the FRITZ!Box:

  1. Click "Smart Home" in the FRITZ!Powerline user interface.
  2. Click the button (Edit) for the relevant device.
  3. Click on the "Switch automatically" tab.
  4. Click on the link "Remove connections from Google calendar".
  5. Click the button "Reset Google Calendar".
  6. Confirm the question about whether you would like to delete all Google calendars from the FRITZ!Box with "OK".

Now all Google calendars are deleted and all smart home devices that use a Google calendar are set to manual switching.

2 Adding a calendar