I don't know what configuration you provider use, but my gives me /64 ND (dynamic) and /56 (static).
I use dibbler and radvd, dibbler stores DUID in file /var/lib/dibbler/client-duid, you can try to set it there, I never need to set this.
But this is on router, I have my own Linux box for router, if you use your providers router and just have clients, you shouldn't need to set anything. It should work automatically.
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