Instagram Videos Embedded are showing Missing Thumbnails on Mobile

When using the Embed block and copying embed code from Instagram, the videos are appearing correctly on desktop and on my mobile device (iPhone 6S).

However, on other users' mobile devices (iPhone 12, Android) they are not seeing the video thumbnails appearing correctly, as they are blank/"view post on Instagram. (see screenshot)

Also, on my desktop/mobile devices, one of the videos allows users to view the video directly in the embed window, while the other two videos make the user open/view on Instagram. 

See mobile thumbnail issue below.  Please let me know if anyone has any idea with Custom Code that could be used to fix this.