Back-catalogue issuance seems to have stalled

Issuing certificates for past orders runs in the background in batches rather than all at once, so a large catalogue takes time and the count climbs gradually. It also honours exactly the same rules as live issuance: the opt-in tag filter still applies, and once the monthly allowance is reached the run skips the remainder rather than exceeding it. A run that appears to have stopped short has usually hit the allowance, not failed.