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I too have a Mac and the HP Envy 4520 and get the same error.  Any solution yet?  It prints with other cxomputers but not mine and gives the "encryption code expired" error message.

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HP Recommended

@rebbesoul 

 

See this post: "Encryption Credentials have expired." when attempting to print or scan from Mac OS or iOS devices.

 

https://h30434.www3.hp.com/t5/Printers-Knowledge-Base/quot-Encryption-Credentials-have-expired-quot-...

 

 It goes through generating a new certificate as well as picking a different print queue.

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