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Without prefix delegation turned on, you probably don’t get an IPv6 address on your lan devices. With it turned on, your router should assign a /64 to the LAN from a different subnet then what your WAN will have.

With PD on, what addresses do your clients get? For the laptop that doesn’t work, what does test-ipv6.com tell you?

With IPv6 you need to have your firewall rules setup correctly, as blocking certain ICMP messages will break IPv6.

Is the static IPv6 chosen for your server from the subnet your WAN is in? In this case, with PD off, if you cannot reach the internet you might need to enable a Neighbor Discovery Protocol proxy to allow the service provider’s router to learn where to find your server.

Personally, I would reenable PD then try to get the work laptop fixed. Maybe disable IPv6 on the work laptop. What I found at my job, is that when I am on VPN from a dual stack client, my company does not give a IPv6 address (or route) on the vpn, but replies with AAAA records causing the client to try to use the internet to reach things behind the corporate firewall.