Hi ​@michelsilva 

As your issue is account related, the support team will be able to help you best. I have opened a support ticket on your behalf and copied the email you have registered with here on Planet Community. 

For other users facing the same or similar issues; if you cannot log into your account please always contact support as they will need personal information in order to help.

You can open a support ticket by emailing support@planet.com

Support helped me resolve the issue. I'm leaving it here in case it can help someone else. Below is the message from support:

I have verified that your email address was associated with our Global AOI Trial program. Regrettably, your trial expired on 2021-12-26, resulting in the inability to log in or reset your password.
 
While the Global Trial is no longer available, we do have other programs that you may qualify for. ESA-sponsored Network of Resources and ESA Earthnet program. You can explore our Education page for tutorials, user guides, use cases, and other examples.

And my solution was:

After I registered and logged in to the website https://eoiam-idp.eo.esa.int/, as suggested, everything worked fine.
The website above is the ESA Earthnet program website, mentioned in the answer.
After I re-registered, the login to Planet.com worked fine with the account