What does it mean when bitpay.com returns:

This invoice has been archived.
Please contact the merchant for order information or assistance.
This error appears instantly after i am redirected from WHMCS invoice to the Bitpay payment page.

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UPDATE: bitpay was accessed via Tor browser (v 6.5.1, based on FF 45.8) but when accessed via Firefox (52.0) it worked and invoice was not archived.