Initiate a link to a call in teams

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Is there a way to initiate a deep link to a call just as in chat :
I am trying to add a button to adaptive card that initiates a call between 2 users on Microsoft Teams. I tried callto: [email address] but the link shows me : "

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even though if I type the link directly to search bar in chrome, it redirects to starting a call in teams. but clicking on the ActionOpenURL button gives me the prev error. 
So I have 2 questions for now: is there a possible way to initiate a call link between 2 users and if not, how can I solve the callto problem? 

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