One of the major advantages of the Microsoft Add-in is that the deployment on your collaborators' accounts is done automatically thanks to the simultaneous deployment.
Please consult the prerequisites before installing the Add-in.
Log into the Microsoft 365 Administration Center, make sure you have the Global Administrator role to be able to deploy.
On the left-hand drop-down menu go to : Settings > Integrated applications
If you can't find 'Settings' press 'Show all'.
Then you need to click on the 'Upload custom apps' button
Load the manifest file with this link: https://nadine.signitic.app/manifest.prod.xml
Click on next then check 'All organization' and 'Next'.
Finally, finish the deployment. Once Microsoft has completed the deployment, you will receive a confirmation email. Deployment can take up to 72 hours.
If you were not able to reproduce these steps, here is a gif representing all these steps: