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PowerApps Model-driven Form Designer Modern View Does Not Display WYSIWYG Form



I have created a Model Driven App using Dataverse custom tables and the Form Designer isn't working.  Initially I created a portal and added the custom tables, then decided to use a model driven app.  Recently I deleted the portal.  


Now I can only access the Form Designer by going to the table and selecting Edit under the Forms tab.  In this case the Form Designer opens but I can't see the WYSIWYG Form.  (See attached)


Also, when I select the Model App and select Edit, I get the error below:


"An error has occurred.

Try this action again. If the problem continues, check the Microsoft Dynamics 365 Community for solutions or contact your organization's Microsoft Dynamics 365 Administrator. Finally, you can contact Microsoft Support."


Any ideas?  Thanks in advance!




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