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When you imported the certificate into Server 16, did you also import the intermediate comodo certificate also? It's possible that Safari and FileMaker 15 have the intermediate CA within its certificate store and FileMaker 16 does not.
Thanks for the report.
Thank you. That solved it for me, too!
For anyone who's wondering, the Intermediate Certificate name from Comodo is:
COMODORSADomainValidationSecureServerCA.crt NOT the one called COMODORSAAddTrustCA.crt
Yep, that did it. Thanks James!