I'm trying to set membership provider with confirmation email. `User` is successfully registrated using memb. provider. 

After registration, a confirmation email is being sent with `userProviderKey` which is used to approve user. Link is sent as follows

```
http://localhost:48992/Account/Verify/e37df60d-b436-4b19-ac73-4343272e10e8

```

User must click on link sent with key (providerUserKey), problem that is this key does not even show in debug mode as parameter

```
// in debug providerUserKey is null
public ActionResult Verify(string providerUserKey)
{    
}

```

What can be the problem?