Hi @Ronnie Kapoor · Thank you for reaching out. You cannot assign/edit value to custom attributes in Azure Portal.
Values to custom attributes can be assigned by users either during signup or you can use profile editing user flow to assign/update the value of custom attribute.
If, as an admin, you want to update the value of other users, you can use below graph call:
Call:
PATCH https://graph.microsoft.com/v1.0/users/object-id-of-the-user
Body:
{"extension_app-id-of-b2c-extension-app-without-hyphen_custom-attrib-name":"Value_to_be_assigned"}
-----------------------------------------------------------------------------------------------------------
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.