In my lab I came across the following error below that logs twice in a day, the error is listed below:
The first thing I checked was all the certificates on Exchange 2016 and I could not see anything wrong with any certificate. They were all showing in the store and were valid.
In this error it was pointing to the local Exchange certificate, creating it and removing the old one seem to make no difference, I wonder if this is not a glitch in Exchange 2016 CU17?
Hope it helps.