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HP Color LaserJet Enterprise M750dn

I need to change the Identity certificate on all my HP Color LaserJet M750s.

I go under Security > Certificate Management where all the certificates are.

I have imported the certificate that we need to use.

However there is no option to select my certificate as the Identity certificate.  And you can not remove the self signed one that it is using.

I can do this on my other HP printers no problem but not on the M750s.

Anyone have any ideas how this is possible??

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