Since you’re using our SaaS, I recommend you open a support ticket.
That said, my first guess is that you have a geo restriction [or another access control restriction] enabled for this entry and so, people from some locations cannot see it.
You can check that by going to KMC->Content. Click on your entry name and go to “Access Control” on the left pane to see whether a specific profile was applied or not.
To see the profile definitions you can go to KMC->Settings->Access Control