Hello @CourtneyS00 ,
Each account is only ever allowed one account owner login with this much accessibility. Both this, and the MFA method, are done for the sake of account security - ensuring customers, especially those with large lists, don't get their accounts compromised. We do have existing feature requests on expanding the customization of users' permissions / adding more user levels, etc. - but nothing specific for allowing multiple logins with the ability to manage everything in the account.
While we wouldn't normally recommend it, if you're expecting to have more than one person that needs full access to everything on the account at all times (including the ability to view and edit billing info, the ability to manage and remove other users, etc.) then I'd advise the following setup:
One thing to keep in mind is that if you're using a more generic email address that any applicable IT person in your organization could potentially access, that means you could also just have everyone but the true owner as Account Managers. Once the original owner leaves, it'd be a simple matter of the next-in-line "owner" resetting the MFA method from the login page using the generic email they already have access to. Then they could get their phone number and preferred MFA method associated with the credentials instead.
Again, while I wouldn't generally recommend this kind of setup for the sake of account security (you can always just go through a standard Account Ownership transfer if necessary), this is going to be the best way to setup the account for your preferred convenience, based on what you're describing.
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