Cant sign print or comment on protected document on android.

I got a new phone running the latest Android OS. I downloaded acrobat. I have a password protected document that was emailed to me as an attachment and whenever I try to sign, print, or comment on it it says "Protected document. This till is not avaliable because this is a password protected document." I entered the password when I open the document. Everything I have found on forums talks about changing the settings, but I do not have any settings regarding protected documents nor do I have a "lock" icon that I can press to get more settings. I can find a million posts about how to sign documents that are protected but none that seem to address this issue of not being able to sign print or comment. And the solutions for these post seem to always involve adjusting settings that I do not have. I contacted support but they just said to look on the forums. Please help.

-Andrew