Box Integration into Outlook

I’ve had Box integrated into Outlook for over a year. Up until recently, I was able to seamlessly move email attachments either to or from Box without any trouble. However, for the last few month, when I click on ‘Save to Box’, the sidebar will open up and ask me to sign in to Box. When I do so, the window I signed in on disappears and nothing changes in the side bar. My company IT department has not been able to fix the issue either. Can someone help?