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Dynamics 365 client authentication

Anyone can help on this 


customer have two dynamics environments for different purpose .

one version is Dynamics CRM 2016 On premise 

other one is D365 online .

users are ON hybrid active directory so they can login to On premise with their local network Id   Eg  domain\username. 

login with inline D365 with O365 account .



When user create a case , From the case form (on Dynamics 2016 on premise)  they need to search the contact against the dynamics 365 online  by mobile number /email address . Once found required to create in On premise CRM and set to customer on the case . 

question is if we place a web resource on the case form for the search with rest API call to D365 , can retrieve the data . .. what will be the best way to authenticate ? 

my idea is to register a app in the azure AD and authenticate through with token based and fetch the data . 

client may ask since already logged  in One system (CRM 2016 ) why need to login again as it may prompt to login if the token is expired . 

APPRECIATE Your expertise for a better way solution for this ...













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