Can't Link Calendars to Alexa

Can't sign in to calendar account or calendar doesn't link.

Check that you're using the correct email and password for your calendar account.
Force close the Alexa app and try linking your calendar again.
For iCloud calendars: to relink your iCloud calendar, generate a new app-specific password to sign in. Go to the Apple website and then to the App-Specific Passwords section of your account.