I created a Typekit Web Project with 300 and 700 weights.
but the rendered result on the screen is a faux slightly darker version of 300. See attached screenshot. Any ideas or things I can check? Note I changed the typeface to Proxima Nova and 700 weight worked fine.
We are sorry to hear you are unable to see the correct weight of the Roboto font on website. We would request you to please check out this article: https://helpx.adobe.com/in/fonts/kb/troubleshoot-adding-fonts-website.html and let us know if that helps.
We would also request you to please share the link of your website so that we can check the same at our end. We'll try our best to help.
None of those tips in the link apply. I've been using Typekit from the beginning (Jason Santa Maria, etc), so I know how to use it, having 2 dozen sites currently using TypeKit...or Adobe Fonts. Note: in my OP I mentioned trying the same CSS file with Proxima Nova, and it worked fine. If you can show me an example of a website using Roboto 700, I might be able to figure it out (the 300 works fine).
Thank you for trying the steps. Would you mind sharing a url for the site you are having trouble with me over a private message? We'll investigate at our end. We would also suggest checking on a different browser. We will try our best to help.