Setting Up Sharepoint Apps On Premises Sharepoint 2016

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I already followed all steps from this url:

https://technet.microsoft.com/en-us/library/fp161236.aspx

And I can install already APPS, and the ICON is shown fine on the site contents page.

However when I clic on it; i get a 404 error

http://app-7a42bbc34f04f4.myappsdomain.com/YoutubeFeedsApp/_layouts/15/authenticate.aspx?Source=http...

The Forward loookup zone and the wildcard cname is already done.

1. Do I need to make any manual step in IIS?, what about if I have 2 Front Ends with load balancer?

Thank you