MailMerge fails with an 400 ERROR
We have log that the error started this morning (2022-01-13 03:37 EST) Some calls were with success, others failed.
Since 2022-01-13 03:52 EST, all mailmerge failed with “Error: ExecuteMailMerge. Exception: There is an error in XML document (1, 40). => was not expected…”
No code changed on our side.
Any idea where to look ?
Any change log of the API that would be breaking ?