I fail changing the VDA Port from 80 to 443. Any hints?

PS C:\Program Files\Citrix\Broker\Service> .\BrokerService.exe /show

SDK Port: 80

VDA Port: 80

StoreFront Port: 80

StoreFront TLS Port: 443

Certificate is in place and I've set even XmlServicesEnableNonSsl =0. https://support.citrix.com/s/article/CTX220062-ssl-configuration-on-vda

this for Enable-SSL on VDA?

It's for the communication between VDA and DDC:

Oh the standard XML from 80 to 443.

yess. VDA is not even necessary as we have only gateway communication.

Did you bind a cert on the DDCs?

i have only ever secured DDC XML traffic over 443, HDX traffic over 443 using the enable-ssl powershell script, VDA registration over port 80 uses WCF so there has never been a need to use SSL as its already encrypted using kerberos

I did. Currently troubleshooting with this article: https://www.archy.net/enable-ssl-on-xendesktop-7-x-xml-service/