Today, I have been trying to install a **SharePoint Add-in** into my SharePoint O365 site from the SharePoint store and the following error message was displayed:

[![enter image description here](https://i.stack.imgur.com/eSDZG.jpg)](https://i.stack.imgur.com/eSDZG.jpg)

Then, I went to my System Admin and followed the same steps to replicate the issue (I even logged in with my credentials), but the app got installed successfully.

This was quite strange. I have never thought that the functionality of SharePoint O365 is dependent on machine to machine.

Can anyone please tell me a resolution to it?

Btw, FYI: I am having SharePoint Admin privilege and also I am an SCA to that Site Collection and both the machines were connected to the same Internet Network.