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User hints on what identity they used to sign up?


For our web app, we allow several different ways for a user to signup (e.g username/password, Facebook, Google) which is nice as we give them a choice. However, we are finding that users sometime forget how they initially signed up and then create multiple accounts (usually with different email addresses). Their intent was not to be able to sign in with different identities but just that they couldn’t remember how they signed up to begin with.

I know that one option for this is account merging but that seems to be trying to fix it after the problem occurred. Does anyone have some best practices or ideas (hopefully already supported by Auth0) of how to avoid creating multiple accounts in the first place?