This can happen when a login attempt fails due to incorrect or outdated credentials. In some cases, browser-related issues, such as cached data or saved passwords, can also cause CORE to display an access-related error message even though the account is still active.
To resolve this, you can sign in to BQE CORE using an incognito or private browser window. If the issue persists, you can reset the password and then sign in again using the new credentials. After the password is updated, you should be able to log in successfully.