New AWS CURs stop automatically collecting after 40 days.
Navigate to the AWS accounts page and find the payer account that needs to be recollected. From there, open the edit columns tab and pull in the "Billing Updates Available" column:
If there is an eligible CUR to be recollected you will see the "Billing Updates Available" column populated with a value:
Clicking on the value will open up a selection list of eligible CURs. From here, select the bill to recollect and then click "Recollect Bill":
After 24-48 hours, the bill will recollect and backfill any missing data.