Signing negotiate context

[Steve French]

I tried an experiment to Samba 4.13.3 and also to Azure sending the
new signing negotiate context during negprot.   Azure ignored it as
expected, but Samba server rejected it with "STATUS_INVALID_PARAMETER"
(it wasn't obvious at first glance what was invalid about it but
perhaps Samba wants different rounding than Azure).

Has anyone tested the signing negotiate context (e.g. newer Windows)
to Samba server?

-- 
Thanks,

Steve