Sometimes the configuration of your organisation's or personal Office 365 account does not initially allow for third party add-ins to be installed. This is the case if you have encountered any of the following error messages regarding individual acquisition of Office Store Add-ins.
This means that the IT department or the Office 365 Admin account has not allowed for third party add-ins to be installed in your current configuration. This is also the case if it mentions anything about the internet connection, when in fact the problem is due to permissions from your IT department. Please note that this can happen before and after the installation of the add-in as a change in settings can lead to this message.
If this is the case, please refer your IT administration to this page for further information:
If you have access to the admin account, go into the Office365 Portal and navigate to User owned apps and services.
The path should be as follows: Admin > Settings > Service & add-ins > User owned apps and services. Once there make sure that the option for "Let users access the Office Store" is checked as seen in the image below:
This should resolve the error messages, in case this does not resolve the issue. Do not hesitate to contact us or share our contact details with your IT department. The support email address is firstname.lastname@example.org