Android App - can not open any unattended computers from list

Hi
One of our employees has 3 x computers in his unattended list, available and working from the computer / web based system without problem.
However in the Android App he can not click to open any of these computers, it simply does nothing, tap on the computer name (online with green icon) and literally nothing happens.
He has a Nexus 5X phone on Android 6.0.1
However I myself have a HTC 10 also on Android 6.0.1 and it works fine.

Any ideas what we can try on his phone?

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Release Notes: Version 1.91, February 2015
Unattended Access (Beta) is live! Unattended Access, a feature requested by a lot of our customers is live now. Currently, it's in beta. You can add up to 100 computers per Technician subscription. They can also be accessed by your organization members. My Computers list in Zoho Assist home page will always display the online status of your unattended computers. You can rename the computers whenever you wish. Currently, Unattended Access can be configured only for Windows computers. Nevertheless,