Some players are currently experiencing issues logging into the game on Facebook.

Please follow the temporary instructions below to fix the issue:

• Click on the lock icon to the left of the website name panel
• Click on "Site settings"
• 
• Scroll the site settings down to find the "Your device use"
• Switch "Ask (default)" to "Allow"
• Once changed, go back to the game page and click "Reload" to apply settings

This should let you log in with no trouble.

The developers are looking into the issue to determine the possible root cause.