Hello
I upgraded one of my SharePoint sites from 2010 to 2013 last night and converted it to claims mode using the
Convert-SPWebApplicationcommand with the -RetainPermissions switch.
However, once I logged into the 2013 upgrade environment I found that my users could not log into the site. I had to add the user group back in and then once I did that the users could get access to the site however the individual users could not get access to the libraries that they did have access to previously. I had to readd the permissions using their domain credentials (domain\username) as when I selected them from the people picker it wouldn't add to the site properly. Now when I look in my list of users in the collection I have some double ups. Also when I select users from the people picker there are double ups. I noticed that some of the users dont have the i:0#.w| in front of their user names. These are typically the users I cannot add to permissions for the libraries.
Finally, if I look at the user information for a user it comes up with 'sorry, something went wrong'. again, its looking for the users that no longer exist in the site collection.
Is there a way I can cleanly fix this?