Hello @srvmig 

Thank you for reaching out to us and welcome to the TP-Link community.

Below are some instructions to set up an IPv6 connection on the wireless router, please review all the settings parameters on the router one more time and ensure they are all correct:
How to set up an IPv6 Internet connection on the Wi-Fi Routers

If the connection still fails, please ensure you have activated the IPv6 service with your ISP line and all the IPv6 parameters are correct, then verify the information as below:
1. What is your network topology, is it ISP modem--C60?
2. Is the IPv4 connection on the C60 good or not? What is the WAN IP address of it?
3. Is the IPv6 connection type the same as IPv4? Are both PPPoE?

4. After the configuration, what is the IPv6 status on the C60, can you please post a screenshot? You can mask the MAC or password info for security concerns.

5. If there is an IPv6 address on the C60 but the computer cannot get an IPv6 address, please show us also the IP status on the PC when it is connected to the C60.