Invalid Grant: authentication failure

Error Message

This error message occurs because the user record attempting to launch Composer is frozen.

Cause

This Invalid Grant: authentication failure error messages appear in the Composer UI when a user launches their Composer button. The error occurs if a Salesforce user is frozen and attempts to launch Composer.

What to Do

Unfreeze the Salesforce user to resolve the error message. For more information on freezing or unfreezing User Accounts, see Freeze or Unfreeze User Accounts.