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After enabling, you will redirect to database page. In that page, select tab Indexes and add 2 Composite indexes to Database by click on Create index manually.
Setting like 2 below screenshotThen, configure fields as 2 screenshots below:
Indexes enable:
Go to Develop > Authentication, enable Sign-in method for Email/Password provider in your project to allow users access to the database, as the following screenshot:
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