The Application Certificate page of the Configure Office 365 Mailbox Access Wizard allows you to configure the certificate used by the Email Signature Manager app.
When Email Signature Manager uses the registered app to update mailboxes, it uses a certificate to perform authentication (i.e. to prove its identity to Entra ID). It is possible to use a self-signed certificate. Certificates have an expiry date, so must be periodically renewed (which can be accomplished using this wizard).
There are two options available:
•Generate a self-signed certificate: Choose this option to make the wizard generate a self-signed certificate, which can optionally be saved to a PFX file to authenticate other computers.
•Import a certificate from a PFX file: Choose this option to use an existing certificate e.g. from a certificate authority or a previously generated self-signed certificate.
When ready, click the Next button to apply the specified certificate and move to the Finished page, or the Cancel button to close the wizard.