@RedRed2025 Do I understand that correctly, iPv4 does not work too? If iPv4 works you should be able to use the option "use same PPPoE session as iPv4".. or in your case iPoE. I'm sorry if I can not help you better because in Germany most providers use PPPoE and not iPoE...
If not maybe your internet service provider can help you.

One last thing I can imagine is when I was reading what iPoE does it just select "Dynamic IP-Adress" for iPv4 and for iPv6 "Dynamic IP - SLAAC/DHCPv6" or basically just try if you don't need to enter any kind of connection details such as username and password.

  @Julian2111 

They refer to it as IPv6 Plus Cross (no username or password required). I’m able to use it without any issues on my Deco BE85, since "IPv6 Plus" appears in the WAN drop-down list.

I guess I might need to wait for the next firmware release for the ER707-M2.

Thanks!

  @RedRed2025 did you try the recent beta that came out, maybe they added it.

Well didn't know that even exist again something new learned ^^