Apply Certificate" option is not available in the NSX UI ServiceVMware NSX 4.2
This issue occurs when the Service Certificate option is selected while importing the signed certificate into NSX.
Service Certificate option.How to Replace NSX Manager Certificates Using CA-Signed Certificates in NSX 4.x
If this KB article does not address your issue or you have additional questions, please raise a support ticket with Broadcom Support and select NSX as the product.
Handling Log Bundles for offline review with Broadcom support.