What does the error message "WSO2 API Manager 4.1.0 reports Basic Authentication failure due to a domain mismatch for user:user@domain.com" mean?

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The error message "WSO2 API Manager 4.1.0 reports Basic Authentication failure due to a domain mismatch for user:user@domain.com" means that the user who is trying to access the WSO2 API Manager is facing an authentication failure due to a domain mismatch. The email address of the user (user@domain.com) may belong to a different domain than the one configured in the API Manager. This mismatch in domains is causing the authentication to fail, and the user is unable to access the API Manager.