Twitter card not showing up on Mobile

Hi,

I liked your plugin. It was straightforward to install. I installed the first image one too since that’s what I needed.

On desktop, when I looked at my tweet, it showed up with the image and summary, but on mobile when I look at the same tweet (in my twitter mobile app), it doesn’t show a preview! Most people look at tweets on the phone, so not sure what’s going on.

Please advise.

As the year draws to a close, a California tween and Davidson Young Scholar writes about a monumental day, Sep 9th, when #SB276 was rightfully passed to keep friends like @BrookeBalck safe! Thanks @DrPanMD @VaccinateCal
#VaccinesWork #teensforvaxx https://t.co/fhyS3ZZ5HR

— Teens for Vaccines (@teensforvaxx) December 23, 2019

Thanks!

The page I need help with: [log in to see the link]