Hi guys,
I would like to connect the power apps portals to dynamics 365 customer service, and I configured the case form on power apps portals, when I submitted the form I found the error as the picture below,

But I have tried to use the form from the custom entity, I can submit the form.
So I guess the out-of-the-box entity cannot use in the power apps portals.
Can anyone suggest to me what's the meaning of the error and can the out-of-the-box entity cannot use in the power apps portals? Thank you. 😊