I was installing DNN Platform on an Azure Website following this documentation on DNN website. But, for whatever reason, my installation never finished and stopped at 18% and gave up. The log button shows nothing. Trying the "Retry" button produces SQL error for basically trying to create existing DB elements.
After installing the website and prior to installing the DNN platform, change the scale from "FREE" to "STANDARD" on your website. Stop & restart - and then proceed to install DNN.