check that your attribute name matches attribute-type
I think you should pass "attribute-type" : "MyAttributes" and pass attribute state and content-state to match your attribute
MelodyKurimi
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you can run Option + Cmd + Enter to preview as canvas
this issue still persist unless restart physic device so it can start for simulator work fine
I am also facing the same issue in development I tried using the same token that was generated with .p8 file now is fine in development on production I haven't test yet