Hi there,
I've been having a bit of difficultly customizing the App for Outlook Person Quick View to remove the Opportunities subgrid. Through the form editor, I have changed what used to be the Opportunities subgrid properties to use Cases instead (as shown below):

However, I get the following error when I load up the app:

I can't seem to find reference to anywhere where it says you can't customize these forms so I am wondering if this is just a bug?
We are on version 9.1.0.2429 of Dynamics 365 online.
Thanks in advance,
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