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I use the same email address to log in the sandbox business account as I do on the live business account.
But on the sandbox account I can't confirm the email (which is already confirmed on live).
I mean I click Confirm in the Business dashboard but the email is never sent. And no notifications found at https://developer.paypal.com/developer/notifications
So because of this (probably) I can't activate a test subscription and complete my integration (getting a code 400 contingency DECLINED_INSTRUMENT)
" Sorry, we couldn't set up your subscription using the payment method you selected. Please try another payment method. "
Please confirm my address manually.