Webinar URL not generating preview on socials?

[nobirds]

Our webinar URLs that we share on socials do not generate a link preview with the webinar topic text or banner image. Seems like a pretty core piece of functionality. 

I've looked into the issue and it seems that there's a problem with the robot.txt file associated with the zoom domain that we have no access to. 

Has anyone else experienced this, and is there a way to fix the issue? It's unclear why this happens and what triggers the issue, but I have encountered the problem several times in the last few months. 

[Ray_Harwood]

Zoom doesn't generate previews for webinar links.  Typically these links go into a button labeled "Register".  The branding imagery and text input by webinar hosts varies greatly, and probably isn't conducive to the creation of previews.