This is my personal opinion. I am not a CPA, Tax attorney or otherwise qualified to give advice for legal purposes.
I would fill it out. Under SSN: I would write no SSN. Foreign national
Provide your actual address in Brazil.
Under section 6. I would write Do Not file US taxes.
Sign it and send it to Amex. That way you provided the form and they can not say you refused to provide the form. The form was filled out as accurately as possible even though it won’t yield the results they want but you complied.
I personally think it’s a pointless. You more then likely aren’t going to keep your accounts.
I would fill it out. Under SSN: I would write no SSN. Foreign national
Provide your actual address in Brazil.
Under section 6. I would write Do Not file US taxes.
Sign it and send it to Amex. That way you provided the form and they can not say you refused to provide the form. The form was filled out as accurately as possible even though it won’t yield the results they want but you complied.
I personally think it’s a pointless. You more then likely aren’t going to keep your accounts.
I apologize for this might not be a proper time to say this but I figure this might help others in the future regarding SUBS and FR/AA ;
When trying to reach a spend for a SUB, be aware that doing it all on the first month “might” or will “most likely” trigger security and fraud algorithms of banks due to their “bust-out” prevention algorithm. However, people with thicker and much longer credit history are most likely exempt or immune from this or people with a current/existing and good relationship with such lender. Based on DPs, Amex’s system typically takes a year to generate a spend profile for each customer so first month of $4K spend on a brand new card member will definitely trigger such algorithm and flag it for FR by a specialist.
Just wanted to share some DPs for myFICO would be visitors and new members.
When trying to reach a spend for a SUB, be aware that doing it all on the first month “might” or will “most likely” trigger security and fraud algorithms of banks due to their “bust-out” prevention algorithm. However, people with thicker and much longer credit history are most likely exempt or immune from this or people with a current/existing and good relationship with such lender. Based on DPs, Amex’s system typically takes a year to generate a spend profile for each customer so first month of $4K spend on a brand new card member will definitely trigger such algorithm and flag it for FR by a specialist.
Just wanted to share some DPs for myFICO would be visitors and new members.
@longtimelurker wrote:
@JR_TX wrote:
I apologize for this might not be a proper time to say this but I figure this might help others in the future regarding SUBS and FR/AA ;
When trying to reach a spend for a SUB, be aware that doing it all on the first month “might” or will “most likely” trigger security and fraud algorithms of banks due to their “bust-out” prevention algorithm. .Why "bust out"? That type of fraud (which seems to the MF answer to everything) involves measured "good" behavior over a long period, before crashing out. So this would be simple fraud prevention.
But I think it's somewhat overstating anyway, and probably depends on the amount of the min spend compared to imputed income and CL. My daugher with a fairly short history just met the min spend of the Altitude ($4500) in one $4900 transaction, within a few days of getting the card. Now a brand new no history person probably couldn't, but that would apply to amounts below the min spend anyway!
Yeah sorry I’ve left out the “slow-play” part of the bust out and for using that very toxic word around here. I guess what I’m trying to convey is, for a brand new card member with very little to no credit history and relationship with a cc lender is to be prepared to get scrutinized in the very likely scenario by putting so much spend on the first month of membership for whatever security/fraud prevention banks may have put in place in their algorithms. Doesn’t necessarily mean they’ll get flagged but just be prepared with all docs just in case.
Just wanna help honest and well-intent people in the future avoid unnecessary headaches. 
Happy Fri-yay y’all!
@JR_TX
When trying to reach a spend for a SUB, be aware that doing it all on the first month “might” or will “most likely” trigger security and fraud algorithms of banks due to their “bust-out” prevention algorithm. However, people with thicker and much longer credit history are most likely exempt or immune from this or people with a current/existing and good relationship with such lender. Based on DPs, Amex’s system typically takes a year to generate a spend profile for each customer so first month of $4K spend on a brand new card member will definitely trigger such algorithm and flag it for FR by a specialist.
Sure. I certainly should know that before. Since I'm used to my brazilian cards, which I carry from more than a decade, I didn't realize I could have problems with US Amex for spending $ 4k in the first month of usage. My bad 
I should have read more before using the card as my only credit card to all purchases.
@bourgogne
random thoughts..make sure all your cards have a zero balance like right now. call the # on the back of your plat card and get them to help you out of this mess. they are not outsourced like the dept you might be connecting with right now or at least you will start of talking with someone in the us, prob florida. you are in a bit of a pickle here, hope it ends well for you. the lesson is rapid spend raises flags with most lenders. if you did this with chase you would be shut down stat
I didn't know the department I was dealing with was outsourced. I will try to call American Express customer service and see if they can help me with this, although everything I could have said I have already told the account manager responsible for my service.
It may be standard procedure to require 4506-T for those who are in the same situation as me (Financial Review), but they don't realize that I am a nonresident and didn't applied and got approved using US Tax Documents, but my credit history and bank of america statements (which I linked at my account when I applied for the cards).
Maybe the outsourced department is adopting a standard practice even though I am a "differentiated" customer because of my nonresident status.
However, I don't think I can escalate the case within American Express, I will have to solve it only with the outsourced department.