Got this working!!
@eskimo reply on this thread helped me finally.
vijaymcadev
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@eskimo Thanks for detailed solution. I helps me to fix the **The staple and validate action failed! Error 65 ** which is diving me crazy since from weeks.
After changing the trust settings for certificate 'Apple Root CA G3' to the issue got resolved and My installer got successfully stapled.
Finally my package installer is ready for distribution.