Registration requires Microsoft 365 admin consent.
Each account is linked to one organisation.
Before you continue
1. You will be redirected to Microsoft's Consent flow to allow the app access to your organization. Log in with an account that has Administrator access to your organization to accept.
2. The app will request permissions such as Manage Exchange as App and Role Management. The app requests Role Management to grant itself Exchange Administrator which is required to manage Exchange mail flow rules, to update the signature.