Use Shift+Key combination in Teamviewer iPad --> OS X 10.15

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I am connecting from iPad to a Mac running 10.15 and TeamViewer. Shift modifier works to input capital letters, but it does not when I give a key combination, such as Shift+Enter to evaluate cells in Mathematica. Command keys such as Cmd+S to save work instead.

I can issue Shift+Key using the menu in TeamViewer for special keys, but that is super annoying for programs such as Mathematica where you need to press Shift+Enter every time you want to compute anything.

How to get shift+key to work in TeamViewer using just the guest keyboard?