I created an apple store link to an App from tools.applemediaservices.com and embedded it in an HTML which I use it in an Email - Below is the a tag.
<a href="https://apps.apple.com/us/app/symphony-secure-communications/id1098963705?itsct=apps_box_badge&itscg=30200" style="display: inline-block; overflow: hidden; border-radius: 13px; width: 250px; height: 83px;"><img src="https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-us?size=250x83&releaseDate=1465171200&h=79f9b0d11830b0975c496e1c6812d49c" alt="Download on the App Store" style="border-radius: 13px; width: 250px; height: 83px;"></a>
The logo appears ok in the browser but when I test in the browser but only displays alt text in emails.
