The Signitic add-in is a complement. Its startup is therefore managed by your Outlook application. If it doesn’t show up after a few seconds on your application, it might mean your application didn’t start correctly. To check this, you can test it on the Outlook Web version. If the add-in appears in the Web version, then this confirms that your application has an issue.
Here’s an action to resolve this issue:
Windows
Open the Run application on your computer,

Type:
"tskill outlook" if you’re using the classic version of the Outlook application.
"tskil olk" if you’re using the New version of the Outlook application.

This should close the Outlook app. If it doesn’t, try the "Tskill olk" option.
Once this is done, reopen Outlook and wait a few moments. Open a new email, and the add-in should appear.
Mac
To access the task manager on your MAC, here is the shortcut: Cmd⌘ + Option + R. Once the task manager is open, force quit Outlook.

Once that’s done, open Outlook again, wait a few moments, and run the test again.
Managing applications on classic Outlook
You might experience a bug with an Outlook option. To check, here’s how to find it: File -> Option -> Advanced Options
Uncheck "show apps in Outlook"
Close the Outlook app and run the test again.
If the add-in still doesn’t appear, contact support through our chat.