If you have multiple Organizations or multiple Accounts, each with a different login email, you will run into problems getting access.
The best practice is to use one email address for all Accounts and Organizations.
If you have multiple Accounts, then add your main email to the Account Holder. See Account Settings.
If you have multiple Organizations, then add your main email as a Member of each Organization. See Members. And to ensure you have full access to that Organization be sure to give yourself Owner Permissions.