On the Licensing Portal home page - https://licence.perceptor-cloud.com/ - navigate to the blue 'Sign in' button. Immediately below that button is the link 'Forgot password?' in blue text.
Click on that link and follow the instructions to re-set your password.
Users are added to a Users Group in Entra ID.
The Entra ID can be customer’s own (preferred) or the Perceptor Cloud Entra ID.
See this support document for more details: Azure users and user groups (perceptor-cloud.com)