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Last Tested: Sep 18, 2019
If you're migrating to Google Auth or LDAP, you can merge from Looker email/password credentials. You cannot merge from any other authentication source. The LDAP setup Docs and Gauth setup docs show the checkbox you need, "merge by email”.
If you're migrating to SAML or OpenID, then this is easier. There is an option to merge users from LDAP, Google Auth, or email. More info in the SAML setup doc and OpenID setup doc.
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