Have to try to look 'through' the magic eye poster, pretend its a window, don't scan it looking for something to popup cuz it won't. Also helps if the poster is big, at least paper sized, looking on a tiny phone screen might not work too well. Also, if your depth perception isn't good maybe try another illusion, since you may not be able to solve magic eyes.
CW: Be ware if you have any motion visual issues like seizures, migraines, motion sickness etc, but the following site has all sorts of illusions
Only thing worse than Waldo are those magic eye posters, I didn't learn how to look at those until a few years after I graduated college.
WHERE IS THE MAGIC IN THOSE I SEE SWIRLS THAT MAKE MY EYES HURT OUCH
Have to try to look 'through' the magic eye poster, pretend its a window, don't scan it looking for something to popup cuz it won't. Also helps if the poster is big, at least paper sized, looking on a tiny phone screen might not work too well. Also, if your depth perception isn't good maybe try another illusion, since you may not be able to solve magic eyes.
CW: Be ware if you have any motion visual issues like seizures, migraines, motion sickness etc, but the following site has all sorts of illusions
spoiler
https://www.ritsumei.ac.jp/~akitaoka/index-e.html