Zoho User Directory management for Invoice

We are paid users of Zoho Invoice.

One of the employees in our organization lost his Two-factor authentication tokens. We looked a t the help docs and it suggested that we go to Zoho Mail control panel to reset/disable Two-Factor auth.

Our email is not with Zoho but we were able to create a free account in Zoho mail and get access to the panel mentioned above. As a free account in Zoho Mail, we see only 5 users in the list (even though with Invoice we have close to 10 users).

Our employee#4 had the issue so we were able to reset TFA. What about if 6th or 10th employee hits an issue? Or how do I disable the account of a user who has left the organization? I can remove access to individual properties by going to Invoice/People/CRM/Sales etc but not as simple as simply disabling a user account centrally.

There should be some independent directory management page outside of Mail. Even within mail, more than 5 users for companies which pay for other services.