Problems with Certificate on new server 8.8.12

[tgx]

I am having issues with my certificates after migration from old 7.x server.
When I go into the zimbra administration console and go to the relevant
Certifcates menu, I receive the message:

The certificate information is unavailable.

I have no other information, no menu options along the top for View Certificate
or anything else. Just a blank white screen with those words.

If I do a zmcertmgr viewdeployedcrt I get the relevant certificate information.

Any ideas on why the Admin console is unable to display the information or
perform any certificate operations?

[tgx]

Boy, this forum has become a fountain of knowledge.
Nevermind, I'll sort it out myself...as usual.

[tgx]

Solved. Not sure what actually fixed it.
If I had to guess it may have been 'zmsshkeygen' followed by 'zmupdateauthkeys'.