What is poppins? I am not sure if poppins is a systemfont at all? It is just a google font, isn`t it?
You may have to "create" your webfont out of tzhe google font with font squirrel.
Like I say, poppins is a google font, downloadable on fonts.google.com, put it best way in one folder after download - open font squirrel - create your webfont-out of it with "woff-eot-svg" and import it as a selfhosted webfont (just from that one folder you created in font squirrel - name that folder as …). Not very difficult, just one way to create whatever webfont you need from google fonts - if you were lucky, it might have been in "Edge Web Fonts" as well but it isn`t and I would anyway recommend to use the self hosted way.
Poppins is NOT on the Windows / Mac web safe font list. Nobody will see it unless you embed it into your site with special code.
Good news! Poppins is available from Adobe Fonts -- free with paid Creative Cloud plans.
1. Sign-in to My Adobe Fonts with your Creative Cloud ID and password.
2. Create a web project.
3. Activate desired web fonts and variants (bold, thin, light, etc..)
4. Copy the code from Adobe Fonts into the <head> of your Muse master page.
NOTE: You may not see Poppins in Muse or your local preview because it's a web font. For best results, upload site pages to server to test it.
Hope that helps.
One of the advantages of Muse was/is that fonts appear as real font and give a good overall feeling on how fonts "work". Yes, poppins is available via typekit but I cannot recommend to use it from typekit as always "they" change something in their settings you´ll have an issue probably - better to use the google font and let fontsquirrel do the webfontkit and use poppins as selfhosted webfont.