If a PDF document prompts you to enter both username and password, it is likely a "ProtectedPDF" by Vitrium or DRM (Digital Rights Management) protected PDF (e.g. eBooks from a library or publisher).
Acrobat Reader mobile apps do not support those "ProtectedPDF"s or DRM-protected PDFs. Sorry for the inconvenience.
The desktop version of Acrobat Reader DC should be able to open it. Would you give it a try?
I have tried to enter it from my lap top but I can't download adobe to my
lap top because it says it is not supported. Are you all working towards
making adobe reader accessible to those of us that use Chromebooks? I have
the adobe reader but from my play store on my Chromebook.
A Chromebook runs "Chrome OS" as the operating system. You won't be able to install or run any traditional Mac/Windows desktop apps (such as the desktop version of Acrobat Reader DC).
My question was not about MY operating system. I know what system I have.
My question was, is Adobe working on opening all the programs offered to
Chromebook users. I have some Adobe programs successfully installed but not
the Adobe reader. So are you all going to open it up to chrome os users?