VCF 5.2
In VCF 5.1 and below, the hostname could be the issue -
https://knowledge.broadcom.com/external/article?articleId=372491
In VCF 5.x versions - the NTP and MTU need to be validated and could also be a cause.
https://knowledge.broadcom.com/external/article/379412/deploying-aria-suite-lcm-from-sddc-manag.html
In the event - the above known issues don't resolve this task. There is one workaround for addressing and bypassing this task.
Raise a case with Broadcom Support in reference to this KB.