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You can't remove someone else from a shared PM... but perhaps you should be able to if they have been added within the last minute.
The reasoning being that this is effectively their content once invited, and who are you to delete their access to content.
But I've made that mistake before as well, and it is annoying and should be undoable.
In the meantime, you can let me know who to remove and I'll remove them
How do you remove someone from a shared PM? Accidentally added the wrong person, can't figure out how to remove.
iPhone - Safari