Some categories of users, who do not have an Ulster identity, authenticate into Blackboard Learn using an alternative method. This is most likely to affect those who have a Pcode which is a username which starts with the letter P.
In order to login with a local account, such as a P code, you should select the button with three dots, highlighted in red, in the screenshot below:
This button will open an alternative login section where you can enter your P code and password.
The video below demonstrates the login process.