Hi Ivan,
Thank you for your answer. I have already tried this as well.
But when I reinstall the Add In and try to log in I still see my configured connections to IBP.
Is it possible that the uninstall is not being well performed. Because nothing changes and this setting are still in the program.
I am using Excel 2010, I have upgraded to 2016 with same result. I am back to 2010 now.