IPv6 on WAN not working after update to 23.1.1

[jonf]

Hi,

Just updated to 23.1.1 and I noticed that I don't seem to get an IPv6 address on my WAN. I didn't change any settings before updating. I currently have the following settings for WAN for IPv6:

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IPv6 configuration type: DHCPv6
Configuration mode: Basic
Request only an IPv6 prefix: [ticked]
Prefix delegation size: 56
Use IPv4 connectivity: [ticked]

This is my LAN setup for v6:

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IPv6 configuration type: Track interface
IPv6 interface: WAN
IPv6 prefix ID: 1
Manual configuration (Allow manual adjustment of DHCPv6 and Router Advertisements): [ticked]

When I go to Services > DHCPv6 > [LAN], it says 'No available address range for configured interface subnet size'. Again I didn't change anything here before updating and it was working previously.

This worked before updating to 23.1.1 so I'm not sure what's happened. Where could I look to troubleshoot why my router doesn't get a v6 address anymore?