I have a website at twoguysplayingzelda.com. I use to be able to post any url and Twitter would create a card (or summary) for it. This no longer happens. I noticed this issue happening around a certain time frame. I just went back to those tweets that at one time I know had the card and now they are gone from those tweets. These cards really help with engagement and bringing people to our site. Does anyone know what can be causing this? It started happening about a month ago. Is it a bug with Twitter? I know they just had a new update fairly recently.
When I put the url into card validator, I get an error message saying “not whitelisted” and no card preview is generated.