Problem Statement:
Can the tenant Admins merge two user accounts from within the Auth0 Dashboard?
Solution:
No, at this time, it is not possible to initiate an account linking operation from within the dashboard.
An alternative available to a tenant Admin that can obtain access tokens with the update:users scope for the Management API would be to perform the linking through the Management API endpoint Link a User Account.
For the tenant Admins who don’t have full admin permissions, such as those only with the editor role, won’t be able to link users because the operation is not available in the users’ section in the dashboard and such they also won’t be able to create/access a client application capable of obtaining access tokens for the Management API.