First, double-check that you’re using the correct login details and the right portal URL (link).
Common issues include:
Using your sandbox credentials for the live system. (IF the URL contains staging, you will be using the sandbox portal)
Accidentally entering the wrong password Having Caps Lock turned on Using an outdated or incorrect portal link
If you’ve confirmed your details are correct and still can’t log in, please raise the issue via the Partner Portal under the ‘Get Portal Help’ section: