The error message indicates that you are using a currency that is not supported.
Here is a listing of Supported Currencies:
Rest API Currency Codes
PayPal Standard Currency Codes
The formatting of the currency code is three characters. For example US Dollars is USD and Canadian Dollars is CAD
For Rest API and Payouts the currency code looks like this in the request:
"currency": "USD"
For HTML:
<input type="hidden" name="currency_code" value="USD">
Thank you,
Jennifer
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