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@hummingbird-curios wrote:

 

Why was the option for age verified postage available with custom postage in the first place?

Likely because Royal Mail used to offer AV for retail and non-account Tracked services but have since restricted AV to business accounts only. Custom postage policies available via eBay are for RM's retail and non-account Tracked services; services that no longer offer AV for personal customers. I believe the change happened around two months' ago so if you originally  listed the item around that time or before then that would explain it. There also may have been a delay in eBay picking up the change so the AV option may have appeared in the custom postage options after that time even though it wasn't actually possible for such a service to be purchased through RM.