@k_cain ,
Go to your SharePoint list, in List Settings, hover over the Property Name field and you will see the actual name at the end of the string that appears at the very bottom of the screen - it is probably something like Property_x0020_Name.
As @Drrickryp said, leave spaces and special characters out of all your naming (lists, fields, controls, forms, variables, collections) and your Power Apps life will become so much simpler.
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