Go to your account and click the SAVE button to regenerate your xml and try again.
Also double check if you actually checked the channel and if the tvg-id is right in your m3u
Sometimes we change tvg-ids out of necessity and then the channel unchecks itself on your page.
Also double check if you actually checked the channel and if the tvg-id is right in your m3u
Sometimes we change tvg-ids out of necessity and then the channel unchecks itself on your page.