The Direct Message Card is a promoted product that is in limited beta for a small number of advertisers at this time, as it states at the end of the announcement blog post. If you are an advertiser on the platform, you should contact the Ads team via their regular help channel.
How about this ? Can you using DM card now. I want to use it too.
If you need to use the DM card please contact the Ads team as described above.