Has the 90-day reporting window changed from 14 days to 7 days for expats in Thailand?

The window for making a 90 day report is the same as it has always been. 14 days before until 7 days after the due date.

SOME immigration offices (Bangkok for example) have a shorter window only for online reporting. That window is 14 days before your due date until 7 days before your due date.

If you apply online 6 days before your due date you'll receive a rejection stating this. And it's posted at the immigration office. You can still go into the office to report 14 days before until 7 days after.