I am getting this error when configuring an asp.net core app to use Azure AD B2C authentication with Microsoft Account as external identity provider.

AADSTS70000121: The passed grant is from a personal Microsoft account and is required to be sent to the /consumers or /common endpoint.

As per my findings on SO and Microsoft documentation on the same, it points to use following as authority in appsettings.json:

"Authority": "https://login.microsoftonline.com/common",

The common endpoint is suggested by Azure AD b2c documentation when you use Microsof Account as an identity provider.

While registering an application in Azure AD b2c tenant, I use following as Supported account types:

Accounts in any identity provider or organizational directory (for authenticating users with user flows)

So seems all is configured properly but still error suggest that I am not using common endpoint which in fact I am using it.

Links I followed:

How to acces AzureRM with a AzureAD Multi-Tenant App using personal Microsoft account?

Error getting SAML Metadata for Azure AD B2C Policy - AADB2C90022