Between 2021-05-14 18:00:0 UTC and 2021-05-15 15:30:00 UTC, the following cards endpoints were incorrectly creating cards where the card_uri would be null. Cards created without the card_uri field cannot be used in Tweets.
Recommended Next Steps: We are investigating whether it is possible to recreate the card_uri field data. If this is blocking advertisers, all cards created during this time using the endpoints listed above and missing the card_uri field should be recreated. After being successfully recreated, we recommend deleting the cards.
Further updates will be available at:https://twittercommunity.com/t/announcement-cards-created-without-card-uri-parameter-resolved/154175