We're building a process for importing our contact lists into mailing lists in an automated manner using the Create Transaction Contacts Import (https://ca1.qualtrics.com/API/v3/directories/directoryId/mailinglists/mailingListId/transactioncontacts")
Things were looking good, tests were processing lists with up to 10,000 contacts fine. When we got to lists of 100,000 contacts we ended up getting a 400 badrequest error. Doing some more research - I find that the error happens on the first batch of 10,000 contacts (limit for import is 10,000). So, it isn't volume related.
Is there any way to determine exactly why Qualtrics is flagging the request as bad? Any details on the meaning of BRE_0.5?
Receiving a 400 badrequest - with BRE_0.5 error code on Create Transaction Contacts import.

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