3817276 - Why are bank account numbers masked in the Expense Pay Extract

When a client switches over to Global Expense Pay, bank accounts will be sent to us encrypted by our third party vendor in order to comply with GDPR. As a result, when our system tries to output the file, we cannot decrypt it and the bank account numbers turn into a nonsensical data like the example below:
 NbpQggxTbHC4vumNu1otaA==:1:U1iW1PhE

The bank account numbers in the Expense Pay extract are masked, despite the setting to mask account numbers being set to 'N'. , KBA , CON-CA-ADM , Administration , Problem