Thanks for reaching out.
I understand you are looking different SignUpSignInPolicyId for different signUp option in blazor web assembly.
You can achieve this by-passing policy parameter in based on specific action in the controller class. Policy parameter allows you to provide different Azure AD policy id for each action.
properties.Items["policy"] = "B2C_1_SignIn";
Hope this will help.
Thanks,
Shweta
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