Some added information to @patelgaurav4u_ios answer:
Look on your certificate info, which apple organization unit was it issued by , e.g. G3, G4, G6 etc..
Open keychain -> System Roots Certificates
Search for "Apple Worldwide"
Check all your your certificate and their Organization unit (e.g G4 etc..)
Unit that was your untrusted certificate issued by is propably missing there..
Download certificate from the same organization Unit that is on your "untrusted" certificate from this Apple site
double click the Apple Worldwide relations certificate
your previously "untrusted" certificate shoulb be trusted and marked green by now
Mr-SwiftOak1
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Hi, did you manage to solve the issue? What was your solution?