Getting /128 IPv6 on WAN

[dsduarte]

Hi guys...
Can you help me on what should I config/check the reason of why is my OPNSense is receiving an /128 IPv6?
I thought that could be an ISP issue but when I connect the modem to an OpenWRT device, it gets an /64 address...
Is there a way to find the log the transaction betweem OPNSense and the modem to get this /128 IPv6?

Or is there some way that I can dig this anymore?

Thanks!

[dsduarte]

I found on settings some config to change logs for debug... I did that and then reloaded the interface...
A saw this:

Error   dhcp6c   transmit failed: Can't assign requested address