Relevant Product: Exclaimer Cloud - Signatures for Office 365
You have installed Exclaimer Cloud Outlook Add-in (Preview) and you see the following message displayed when composing an email message:
This message appears because the current Exclaimer Cloud Outlook Add-in is in Preview mode and the signatures are not automatically added when composing the message. You will need to select the required signature from the right-hand pane listing all your signatures.
This message will not appear once the Outlook Add-in feature is available within the Production channel release.