I'm on a MacBook Air. I'm getting repetitive messages to grant Sharepoint access to my keychain.

I'm on a MacBook Air. I'm getting repetitive messages to grant Sharepoint access to my keychain. I have to select deny about 10 times and the message disappears for a little while and then I go through it all over again a little while later... over and over. I read the instructions for removing this from my keychain, but the thing is, I don't use Sharepoint and neither it nor Office are appearing on my keychain access. So I'm stuck. It's very frustrating and eating up a lot of my productivity time.