Github user shinrich commented on the issue:
https://github.com/apache/trafficserver/issues/1459
Found this was an issue in the changes made in our version of 7.1 shown in
PR #1446. I will update the PR with the fix. As it stands, if there is no
servername hook, the cert hook will never be called. This means that
certificates specified by the SNI name will never be selected.
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