Sorted_metaarray key not receiving on the client side

receiving it using the handler in real time

when i hit this url to add sorted_metaarray
https://api-847E89AF-7271-42B8-BCBE-FDCFBB16F99A.sendbird.com/v3/group_channels/sendbird_group_channel_8751938_f4a3f58aab375c188db6cd73e01604c6700c3ee6/messages/83735383/sorted_metaarray

i get this response:

{
    "message": "\"Key, value pair already exists\" violates unique constraint.",
    "code": 400202,
    "error": true
}

this ensures that the message has the required meta array but when i try it on the client side then i don’t get it.

as you can see the mMetaArray is empty