Hi @hesperanca
A possible technique I would suggest (as we do this in our organization) is to not merge identities in Auth0 and keep them separate and handle the merging in your system.
The advantage of this is by default the identity will be treated as a separate user so there will be no accidental merging of accounts.
The disadvantage is that instead of linking Auth0 to your system using email, you must link Auth0 using the Auth0 ID number provided.
This method will give you more control on how the users are merged but will also require more work on your end so you’ll need to consider the pros and cons.
Hope this helps!