You will need an office365 account with administrative access to visit https://admin.microsoft.com
1. Please click “Show all” on the left side, and then click “Settings”
2. Click on Settings - Integrated apps
3. Click on Upload custom apps
4. Select “Provide link to manifest file”, and enter the following link: https://eu.gaiaworkspace.com/manifest.xml
Then, please click “Validate”
Note: If it fails and pops up “manifest file here”, you will need to cancel and try again.
7. After accepting permissions, you can proceed to next step “finish deployment”