Cannot open Zoom links in Outlook for iPhone get tap to install Zoom

[SoftBoy159]

Hi all

I have a few users who have Zoom Workplace on iOS devices , these are new devices, all up to date and have Zoom Workplace installed. When the users click on a Zoom link in Outlook for mobile they are greeted with "did not open Zoom? Tap to install Zoom Workplace app". I have uninstalled and re-installed the app, tried using different meeting links but get the same issue. 

Any idea how I can troubleshoot this issue?