If you're trying to set up a shared Medium account that multiple people from the same organization can sign into, we recommend setting up a shared-access email account in your company domain or a shared Twitter account linked to your Medium account. This would allow anyone with access to the Twitter account to sign into the linked Medium account.
Likewise, anyone with access to a shared email account can receive Medium's email sign in link (valid for 2 hours) to access that account.
Please note that our Paid Terms of Service do not allow for sharing a single Medium account to provide membership access to multiple people. You can only share accounts for publishing purposes.