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When integrating tiles into a Web Application, I can get it to work with tiles that uses the standard visualizations but not custom visualizations. I am using the methods from this article: https://powerbi.microsoft.com/en-us/documentation/powerbi-developer-integrate-tile-load-tile-iframe.
When rendering a custom visual I get the following message. iFrame result
There is already an idea at https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/12990723-integrate-customvisuals-..., you may vote it up. And you could consider integrating a separate report into an app for the time being.