New API Canada, accerlerlist won’t work

I went to add a new batch on Accerlerlist and found that the interface had changed, now none of the items added printed labels right away rather all labels are available after the batch is done. Though adding the batch to amazon only produces error messages and the Accerlerlist support told me that my error message was due to amazon “not wanting” my items? Is this right, has anyone else had issues as well or am I just dumb?