I did and it works but then I got confused looking at the webclient and enabled integration there too so I was getting that window pop-up as above also.
Can you explain how you are getting that pop up? The Office 365 integration is only provided client side, so the 3CX Web Client should not be involved here. What did you configure in order to see that pop up from the web client?
But you need to change that URL to the value you need. That's just an example so you can see the variables that you can use (caller number and display name).
I'm not sure if Office 365 has a search URL like that. We provide a different integration, you should try it instead of doing this. Or you will need to investigate yourself the Office 365 APIs in order to get the proper URL to configure here...