According to zxcvbob :
Chris Lewis wrote:
You'd have to finesse the oven's "requirement" for copper wire. I don't
know where the instructions mean "no Al WHATSOEVER", or, "Al is fine
if you connect properly, but copper is so much easier, don't give yourself
an unnecessary headache".

Probably means the terminals are only listed for copper. If you
hardwired it, you would need all copper wire. If you use a cord and
plug, the cord with have copper or brass terminals already installed,
and it's none of the stoves business what kind of wire you used for the
receptacle.

I should mention that you can always pigtail aluminum to copper IF you
do the connection correctly.

My 100A subpanel is pigtailed - obviously the electrician didn't think
it was a good idea to run #3 Al into the "used" 100A dual breaker
he had installed in the 20+ year old Commander main panel. So there's
a 4x6x6 box sitting beside the main that simply splices a short
chunk of #2 copper to the panel.

But on the other end, the Al connects direct to the (then) brand new
Seimens subpanel.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.