Can I use “Resource Owner Password Grant” flow with Azure AD B2C

Question

I need to be able to get an identity/access token to a backend API for a native client, where the native client must use native UI to collect username and password.

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Answer 1

Is it possible to get a token from Azure AD B2C by programmatically posting username and password somewhere?

You can use the Azure AD Client Credential Flow to obtain a token. See this SO Post.

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ROPC might be the right OAuth Flow for you, but before you start using it, you might want to check out this blog post: Why the Resource Owner Password Credentials Grant Type is not Authentication nor Suitable for Modern Applications.