As GUF issuance / deletion now needs to be monitored, have there been any instances of jokers not materialising / vanishing? Mine have been correctly used up for this status year, some more due shortly.

Jokers aren’t, and have never been, visible online so I think the only way to check them is to call / email the GGL team. Trying to remedy any error may be tricky as they don’t seem to have an attached reference number, although maybe that needs to be asked for at the same time as issuance is verified.