As an MS Office administrator, you can configure the c365 add-in for Microsoft Office using your Microsoft Office admin account so that it is available to a few selected users or all users in your organization.
Sign in to your Microsoft Office 365 admin center using your credentials.
Select Home.
From the left navigation bar, select Settings > Integrated apps.
Figure: Integrated apps option
On the toolbar, select Upload custom apps. The Deploy New App wizard appears.
Select the Upload manifest file (.xml) from device option.
Select Choose file, upload the provided/downloaded file, and select Next.
Depending on who you want to deploy the add-in for, select one of the following options and select Next:
Select Accept permissions and sign in using your Microsoft Office 365 admin account.
Select Accept in the Microsoft permissions dialog box to give permissions for accessing office application.
Select Next and then select Finish Deployment.
On the Deployment complete screen, select Done. The c365 add-in is listed under Integrated Apps.
For more on this subject, please refer to:
Deploy add-ins in the admin center - Microsoft 365 admin
Alternatively contact [email protected] or your local reseller.