Unable to connect Amex Credit Cards - Care Code: QCS-0400-6 (edited)

PRC Member


I am unable to connect my Amex credit cards through the new API. I am able to successfully reach the Amex login screen, log in, select each account, and grant access to Quicken; however once I hit the "return" button the connection fails and I get the following error:

Request failed with status code 400
Care Code: QCS-0400-6

I haven't been able to find this code anywhere so hoping I can get some assistance on how to resolve.

Thank you!



  • aww
    aww Member

    I am having the same issue.

  • benjah
    benjah Member

    Same issue, amex cards no longer connected.

  • Coach Natalie
    Coach Natalie Administrator, Moderator admin

    Hello @PRC, @aww, & @benjah,

    Thank you for posting to the Community regarding this issue, although I'm sorry to hear that you're all experiencing difficulties connecting to American Express in Simplifi.

    To clarify, is the issue occurring on existing accounts, or when attempting to connect to American Express for the first time? Also, is this occurring on just credit card accounts for all of you? If so, do you have any other accounts with American Express, and are they connected in Simplifi?

    For those of you who are experiencing this issue on an existing account, please follow these steps:

    1. Make the account(s) fully manual: http://help.simplifimoney.com/en/articles/5321064-how-to-make-an-account-manual
    2. Go through the Add Account flow to connect to "American Express" again: http://help.simplifimoney.com/en/articles/4295304-adding-accounts-in-simplifi
    3. If/when your account(s) are discovered in Simplifi, make sure to carefully link them to the existing Simplifi account(s): http://help.simplifimoney.com/en/articles/4959544-how-to-link-accounts
    4. If the account(s) are not presented as available to link to when using the "American Express" option, or if you receive an error again, follow the same steps using the other American Express options of "American Express - Banking" and "American Express Bank FSB". Please note that you will not go through the API with these other options.

    For those of you who are experiencing the error when connecting to American Express for the first time, please follow step 4 above and attempt to add the account(s) using the "American Express - Banking" and "American Express Bank FSB" options.

    Please let us know how it goes!

    -Coach Natalie

  • blueflax
    blueflax Member
    edited May 2023

    I have been dealing with this for DAYS - so FRUSTRATING.

    I've followed the instructions…make Amex accts manual, click to Add Account, go through Amex login and authorization, then when it returns me to Simplifi I get a "404 ERROR" page EVERY TIME

    EDIT the trick was to NOT use the AMEX button, but use the individual Amex options that come up using the search bar

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