SharePoint FBA “No exact match was found” error
If you are configuring FBA for SharePoint and, at a certain point, while trying to add a database user or role to SharePoint you get the “No exact match was found” error, the answer is one of the following 2:
1. the Central Administration App Pool account does not have sufficient rights on your SQL aspnetdb database
2. something is not configured properly in one of your web.config files you just modified
As option No 1 is the easiest and quickest to check, I’d start with that one.

