There should not have been any changes in tunneling from a recent version to 2.8.0. All our testing showed tunneling still working in the same way as in previous versions.
I would definitely suggest going to www.adtran.com/openacase and opening a ticket with our Product Support team on the issue. We should be able to figure out why the functionality is not working properly.
ADTRAN Product Support Engineer
After a reboot of the vwlan and all AP it start to work again.