Account Related References
Enabling Multi-Factor Authentication for Your AWS Account
It is recommended to configure Multi-Factor Authentication (MFA) for the root user and other AWS users. Refer to Multi-Factor Authentication (MFA) for IAM for instructions.
Sign Up for an Apple Developer Account
Refer to How to set up Sign in with Apple for Amazon Cognito to sign up for an Apple developer account.
Sign Up for a Google Developer Account
Refer to the links below to sign up for a Google developer account:
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Cognito User Pools - Social Identity Providers > Search for "To register an App with Google"