DS Video issue when using Custom Domain

with either 7.1.1 or 7.2 here is the issue…

Using DS Video app or any DS video app and any device…

It does not find the server when a customized domain.

See Control Panel>Login Portal>DSM>Domain

when i place my customized domain of nas.cloudbusinessportal.com in the field, application using DS video stops working. When i remove the field, the applications work.

Anyone else want to chime in on this anomaly?

PS, all other application like Synology Photos and Synology Drive are not affected.