Why can't I install Skype from the Play Store to bauhn sphere b5 phone?

[AC Question]

cannot install skype from play store to bauhn sphere b5 phone

access play store ok but when select "install" shows a list of access requirements with an "accept" button.
the accept button is not active and install does not proceed

is this a 3rd party access issue or do I have another problem?
android version 4.2.2
phone mem 16gb
sd card 32gb

thanks, Richard