The problem is very simple. The “PDF forms” in question are really XFA forms which for better or worse are not supported by either the iOS or Android Adobe Acrobat Mobile Reader products. These XFA forms files were created by either LiveCycle Designer or similar non-Adobe authoring tools.
FWIW, there are other PDF readers on mobile devices and conventional computers that also cannot open or even worse properly process such XFA forms.
This is one of a few situations in which you need to use either a Windows or MacOS-based computer to properly open and fill such forms files.
There are not currently any plans to retrofit XFA support into the iOS or Android Adobe Acrobat Mobile Reader products.
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