Introduction
American Express accounts need to be added one at a time. Otherwise all cards subsequent to the first on will fail.
Go through the connect accounts process and select only one account for adding at a time when presented with a list of available accounts on Amex's site. Subsequently repeating this for the remaining account(s).
Topic Area
Bank accounts, American Express (Amex)
Relevant to users on:
Money Dashboard Neon
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If you are unsure if you are on Money Dashboard Classic or Money Dashboard Neon? You can find that information here