Signed Gmail calendar does not change/create events.

I have three accounts configured in Outlook, each with its own calendar. I had to format my computer, and upon reconfiguring the accounts, the Gmail calendar does not create or alter events on the web, only locally on the machine. All meeting acceptances need to be done on the web to be updated in Outlook. I have already uninstalled and reinstalled Office 365, reconfigured the accounts, and nothing has changed.