Failed to find any key to satisfy on group audio call

[maulikgoyanidbc]

I getting this error on group audio call in iOS.
Can any one let me what is issue and anything need to change in iOS side or server?

Failed to find any key to satisfy: _FetchKeyRequest(server_name=\'<our_matrix_server>\', minimum_valid_until_ts=1707988292197, key_ids=[\'ed25519:a_KUzx\'])

Thanks in advance