Here are the steps to remove the add-in globally from all your users.

  1. Go to Microsoft 365 Administration Center

  2. On the left dropdown: View All > Settings > Integrated Applications

  3. Click on the Signitic add-in in the list of apps

  4. Click on remove app

  5. Then check the validation box, and delete.

If you didn't manage to follow these steps, here is a gif to summarize the procedure.

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