I got a confirmation from the Open PermID team that GLDJ.J is of Commodity ETFs (TRCSAssetClass.mdaas = ETFC) type which is not supported in permid.org.
You can also find all available Quote PermIDs in the quote entity bulk download at https://permid.org/download.
I am unable to search this RIC (GLDJ.J) on the Open PermID website.
Therefore, it seems that this RIC is not in the Open PermID database. I will contact the Open PermID support team for confirmation.