For example: https://gmb.io/ff/
The Twitter meta on the page is correct. It is valid according to the https://cards-dev.twitter.com/validatorUsing curl -A Twitterbot https://gmb.io/ff/ returns the correct markup.
curl -A Twitterbot https://gmb.io/ff/
The image is big enough.
And both the robots.txt on the site and the CDN allow for the Twitterbot and is in proper plain text with ASCII encoding:
And I've gone over everything else here: https://twittercommunity.com/t/not-whitelisted-unable-to-render-or-no-image-read-this-first/62736 to no avail.
This seems to be working now so I assume it was re-crawled over the weekend.
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