I’m writing this post for me, more than anyone else. I keep forgetting!
Log into your Power BI tenant and click on the Question Mark at the top right hand side.
Look for the option About Power BI. Here is an illustration below:
Choose the option About Power BI and you will get a window appear. It’s the last item that shows what you need:
//embedr.flickr.com/assets/client-code.js
So my tenant is located in North Europe.
I usually end up going to look for it in Tenant Settings but I suppose it isn’t there because you can’t change it. So I got fed up with myself forgetting it and wrote this post. If this is you too, I hear you.