We have some problems with Outlook and Exchange.
We have a user, lets say it's user 'Trainee1'. It's linked to the mailbox 'Trainee@company.nl', and when initializing outlook, we fill in the credentials of this mailbox as user: domain\trainee, with the password of this account.

Instantly we get a red message, below the credentials box, "Failed to extract credentials".

Any clue what this can be?

I'm not sure if it's something in Outlook, Windows or Exchange.
The message is shown in the 'standard' windows credentials popup.

[edit]
Screenshot of the error

[![Screenshot of the error](https://i.stack.imgur.com/X3uqS.png)](https://i.stack.imgur.com/X3uqS.png)