Missing alt text error

the thumbnail is not an <img (which could have an alt-attribute) but a background-image on a div (which cannot have an alt-attribute), it does however have a title attribute (which you can see when hovering over the LYTE player).

hope this clarifies,
frank

How to resolve this issue?

https://ibb.co/jLkGZKq
https://ibb.co/HT5HD1y

there’s no solution, a div cannot have an alt attribute.