Hi @Cisco ,
Thanks for reaching out.
Unfortunately, there is no direct migration from one Azure AD B2C tenant to another B2C tenant.
You can export/import users using just in time migration and call Graph API or use custom flows to make your users move to the other tenant during sign-in using REST API.
Reference: https://github.com/azure-ad-b2c/samples#user-migration
However, Passwords can't be "migrated" in any case.
Hope this will help.
Thanks,
Shweta
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