Could you try to run the next command to search for duplicated certificates under the same serial numbers:

/usr/lib/vmware-vmafd/bin/vecs-cli entry list --store TRUSTED_ROOTS --text| grep -A 6 -i alias | less

Also i was reading a little bit and it seems that the resolution for some of the folks was updating vCenter Server to 6.7 U3g which is build 16046470