My ISP is Hyperoptic - they provide a 1Gbs direct fibre connection to the home. I have a static IPv4 address provisioned by them, and it appears a static v6 address also since the address given above...

@Solla-topee Yes, I've read the FAQ, and frankly that gives zero information in relation to the issue I'm experiencing and as I outlined in my original post. The error given by the router gives zero...

I'm having difficulty in entering my ISP's provided IPv6 configuration into my Archer C2300 router. Essentially, whatever I try, the router responds with 'Invalid format' for the addresses, and I'm...