There were many discussions between the two nations via diplomats about the upcoming German invasion.
Hitler continually made overtures to the Japanese through diplomatic channels.
I have never seen material to this effect, which doesn't mean it's nonexistent, of course. Could you perhaps provide examples?

He hoped that Japan would feel obligated to reciprocate his solidarity by attacking the Soviet Union.
Hoping that Japan would feel obligated is far different than 'courted...for nearly a year'.

I'd also be curious why Hitler would feel the need for Japanese participation given that in the original planning for Barbarossa the campaign was to be concluded within six months.....