If dismissed (and you didn't tell him to "wait right here"), he should be in Trademeet just south of the fountain where you first meet him. Alternatively, maybe if his approval score was too low, he leaves altogether. I think there are a few companions who do that.
Game is still pretty buggy with the companion scripts. He may have just vanished due to coding weirdness. You can respawn him with a console command like this https://forums.beamdog.com/discussion/68607/trying-to-respawn-rasaad-bg2-ee
But not if you are on iOS. where you can’t have the console, for no very good reason I can figure out. For iOS you could post a request in the support forum and a kind soul may fix your save for you
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https://forums.beamdog.com/discussion/68607/trying-to-respawn-rasaad-bg2-ee
But not if you are on iOS. where you can’t have the console, for no very good reason I can figure out. For iOS you could post a request in the support forum and a kind soul may fix your save for you