For the SSL certificate validation, you can obtain the SHA-256 thumbprint from VMware Identity Manager host.
Procedure
Results
SHA256 Fingerprint=3D:E8:4C:CD:19:D6:AD:23:30:86:E4:A1:72:D5:22:08:F9:72:6D:D3:E7:6E:99:32:C8:C7:3D:F8:E2:91:91:AE
What to do next
Copy the thumbprint and paste it in the configure VMware Identity Manager page.