Using LiveCycle I created a form with expanding text fields and saved it as a PDF. I enabled user rights in Acrobat. It opens/works fine with Reader on Windows 7. But I cannot open the form using Acrobat DC on my iPhone. I have an Acrobat DC for Windows subscription and signed into Acrobat on my iPhone. But I get this error: "This form requires adobe acrobat reader dc for mac or windows." Is the problem that I need a subscription for Acrobat on Mac?
The Acrobat/Reader apps for Android and iOS simply do not support XFA-based forms. When you need forms on mobile devices you can either create static AcroForms with Acrobat or HTML forms with AEM Forms. The latter requires tha you have access to the enterprise software Adobe AEM Forms.