This error happens rarely, but it happens nonetheless:
It apparently just happens from using the PromptProductPurchase API. Here is one example in my code where this error happens in my experience:
Expected behavior
The PromptProductPurchase API should not throw an error about it being a blocked function.
Thanks for the report! We’ll follow up when we have an update for you.
The error message seems eerily similar to an error message a specific Script Executor will produce if certain functions on their blacklists are called:
, but it’s just speculation.
I am experiencing this issue with the PromptGamePassPurchase API. Doesn’t happen a lot, but the issue is occurring. I haven’t seen any issues with the PromptProductPurchase API in my experience.
Posting to let you know that this issue has also affected some players in my game. It would be great to get an update on this 
.
One player who plays my game is consistently having the issue with the error “Attempt to call blocked function PromptProductPurchase on service MarketplaceService”. I can’t reproduce this myself. The user claims that it also doesn’t work if he switches account. The call to the API is made on the client.
But the error report shows it comes from one of my scripts. Could it still be an executor bug?
cc: @The_SirMeme @HexadecimalLiker
Yeah, that’s what I meant. If you check the post I conveniently linked, you will see that the detection works as every script gets affected by the blocklist that I speculate is causing this.
