How to land emails into outlook inboxes?

What are people using for their email health tech stack (i.e. email warm-up tools) to land into outlook/microsoft inboxes specifically?

My understand is that outlook is the hardest to land into. Using a glockapp test we have 100% deliverability into gmail, yahoo, basically every provider except for outlook, which is basically at 0%. This is partly because outlook has the strongest spam filter. For example, it looks at domain age negatively (the younger, the more likely it is to land in spam).

How have others been able to ensure they're landing in outlook inboxes (~ 40% of businesses in the US)? One issue with many email warm-up providers is that a very small % of their company-owned inboxes are outlook (i.e. for warmupyour.email only 2% are outlook).