A customer has an on-premise farm with url http://xx-robot-xx:5601 Is it possible in anyway to embed this into SharePoint online? In settings you can do something like this:
But this do not allow any ports and does not work.
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First, try to use the SharePoint online embed web part if does not work follow the below approach.
Create alternate access mapping for the said port URL, then update the host configuration in the web front end server then configure the newly alternate access mapping URL in the HTML security setting.
You may refer the below thread as well:
For embed web part in SharePoint Online refer the below MSDN article: