Here I explained how I warm up FB accs. https://mpsocial.com/t/facebook-making-it-too-difficulte-you-cant-log-in-at-the-moment/29377/4?u=junk-dna
In essence:
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You need to work as slow as possible, and mix casual and commercial actions.
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Do what humans do, not what bots do. Meaning, chat with other people.
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Work slower on recently re-activated accounts, work faster only when account had been wormed up a lot.
Don’t buy PVA accounts or aged accounts. Non-PVA and 2-3 months old accs, that I verify myself with SIMs I buy locally, are good for me.
I am a firm believer that eventually an account can be wormed up enough that FB will never block you. Actually I had created such accounts recently. I was doing 50 group postings in under half hour and never got blocked. Only got into FB jail for 2 weeks ;-), but no security questions etc.
Simply put, FB can’t afford to block real humans from opening new accounts. Because that would mean that their company will stop growing. So If your bot behaves like human, than it looks like human to FB’s bot 
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FB will always loose against us.