dhcpv6 on ppp interface not working: Unsupported device type

[wax g.]

Hi,

I'm trying to use isc-dhcp-client to get a global ipv6 address & prefix
delegation (IA_NA & PD) for a ppp interface but get this message instead:

* Unsupported device type 512 for "ppp0"

cli# dhclient -6 -P -v -N ppp0

Versions:
* Tested unsuccessfully  4.4.1 on debian buster.
* Tested unsuccessfully  4.4.2 on debian buster.

I've seen similar error messages dating from 2009 / 2010 and i thought this
would be solved by now.

Has anyone been able to make this work using isc-dhcp-client ?

Thanks in advance,
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