Found the error in /var/log/vmware/vsphere-ui/logs/vsphere_client_virgo.log:

[2022-11-03T15:31:03.619Z] [ERROR] http-nio-5090-exec-4          com.vmware.vise.mvc.exception.GlobalExceptionHandler              Exception handled while processing request for /ui/certificate-ui/ctrl/certificates/tls:  com.vmware.vapi.std.errors.Error: Error (com.vmware.vapi.std.errors.error) => {
    messages = [LocalizableMessage (com.vmware.vapi.std.localizable_message) => {
    id = com.vmware.certificatemanagement.error,
    defaultMessage = Exception found (0),
    args = [0],
    params = <null>,
    localized = <null>
}],
    data = <null>,
    errorType = ERROR
}

Full error attached.