Call intercept not working on mate 10 pro and p20n pro, EMUI problem

[dryspuri]

Hi, i regularly use ringo application for international calling, its got bith ios and android apps, advnage with android is that i select international number to call, automatic call intercept function kicks in and ringo opens up, giving me option to make a call through app instead, ios obviously does not have this function. Mate 10 pro this automatic call intercept does not work, I am sure its emui problem, but dont know how to get around it!! any one have any ideas, Ringo customer service is pretty much useless.