When signing up for Oracle Cloud, Cloud Account Name must be provided.
Login to Oracle Cloud Infrastructure Classic using Cloud Account Name
https://myservices-CloudAccountName.console.oraclecloud.com
Login to Oracle Cloud Infrastructure (most simple and need to enter Cloud Account Name)
https://www.oracle.com/cloud/sign-in.html
Login to Oracle Cloud Infrastructure Region (need to enter Cloud Account Name/Cloud Tenant)
https://console.us-phoenix-1.oraclecloud.com
Login to Oracle Cloud Infrastructure Region using Cloud Account Name
https://console.us-phoenix-1.oraclecloud.com/?tenant=CloudAccountName
If you find more, the please let me know.