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Found the issue to be related to the ISP still having some issues that were resolved after another outage yesterday and compared configurations with another user here: https://forum.opnsense.org/index.php?topic=46120.0

Great to have a point of reference. We had the same configs except that as an attempt to get basic connectivity working, I had unchecked the non-temporary address allocation and forgot to set it again when I re-entered the previous working configuration.

Hi
Just wondering if you found a solution and would willing to share the working config.
I started fresh on 25.1 and had it running before on pfSense before switching.
both ran the config for kviknet, that I found somewhere online here: https://imgur.com/a/kviknet-opnsense-ipv6-jHchkbN

Since their outage last week, support claims tha they now use standardized DHCPv6 stateless/stateful connections. Have been writing them over email since monday and no matter what I tried, I could not my previous /48 prefix in any packet capture until this evening when I tried again.
Now I suddenly get my prefix again.

If I try to connect to any IPv6-only ressource, I cannot connect and even a ping does not work from any device on my LAN interfaces.
using the ping tools in opnsense indicates that it works as long as I leave my source address blank or set it to the adress assigned on my WAN interface. If I set it as the address assigned to any of my LAN interfaces, the ping does not work.

It seems as if the routing of packages does not work once you use an adress that is different from the one assigned to the WAN interface

Hi
For a little over 6 months I have had a system running, which got a fixed IPv4 over DHCP from my ISP and similarly it was assigned an IPv6 over DHCPv6 as well.
They do however not use prefix delegation and as with most ISP support options, they will only support their own routers. Looking around I managed to find information (although it was for pfSense) on someone who got it working to have the ISP give out the assigned /48 IPv6 prefix by setting some options in the advanced section of the DHCPv6 client on the WAN interface.
It worked fine, although I had to do a packet capture and extract the assigned prefix using wireshark and assign static /64 subnets to my internal networks.
A few weeks ago my ISP rolled out a configuration change, which for some reason broke the IPv6 routing in both directions. I reached out to their support and they informed me that "they have changed their data transmission protocols and you need to configure your router to use DHCPv6 (stateless/stateful) - dynamic IPv6-adresses". From what I can see it is not DHCPv6 Prefix-Delegation and therefore my current configuration should still be valid

In OPNsense, I have my DHCPv6 client set to advanced and under interface statement, I have defined the following Send options:
ia-pd 1, ia-na 1
I have also enabled Non-Temporary Address Allocation and assigned id-assoc na ID as 1 and also set Address IPv6-address as ::/0
Prefix Delegation is enabled and set id-assoc pd ID to 1 and Prefix IPv6-Prefix is set to 48.

What would I need to change in order to get IPv6 working again and is there any information that I need to request from my ISP?