Router : TP-Link Ax6000

Hardware: V1

Firmware : 1.3.2 Build 20230906 rel.52143(5553)

Issue : 

Hello, I'm trying to set up an IPv6 connection on my router, but I'm facing issues. The connection either connects briefly and then disconnects or doesn't connect at all. I’ve tried various settings in the IPv6 advanced options, but the problem persists.

I know my ISP (Etisalat) supports IPv6 because I’ve successfully connected with a different router before. Can someone assist me with resolving this issue?