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Looks like the certificate expired.

This is in the above text - "Your client certificate is either not trusted or is invalid."

Or someone enabled check client certificate and didn't realize the implications.

Stumbled upon a different InterSystems github project that in my testing and with a little configuration works as I expected (https://github.com/stefanc82/Cache-DynamicObject-Adapter). Any thoughts on which project might be the preferred path for future?

I didn't come across this project when I searched github for projects that mention %DynamicObject/%DynamicArray. I'll look into this project as well.

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