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It appears to be correct...are you sure

context.newRecord.id

is outputting what you think it is?

Yeah, maybe try hard coding that field. If thats not the culprit, maybe try attaching to a transaction or entity to see if its the custom record object that is specifically not going right

What sort of script is it? If it’s a user event before submit running in create mode then

id

will be blank as the record has not been persisted yet & you’ll need to stick it in after submit