Funny thing I ran into when configuring certificates on the edge server. While the public certificates where already in the certificate store I was unable to see them through the GUI, as shown here:
The only solution here is to use PowerShell in order to assign the certificates.
So I executed the PowerShell commands needed for assigning the certificates:
The certificates were assigned but I received a warning, it turned out that the certificate chain couldn’t be verified. After fixing that part everything started up nice and the database synced with the rest of the lync servers.