PayPal error 3005 using Magento and standard payments - paypal

I've already posted this on the PayPal mts and the x.com sites but had no response.
I am looking at a clients website which is having issues taking payments using the PayPal standard payments. The Magento based site (CE 1.6.10) redirects to Paypal fine but when a customer tries to pay PayPal goes to and error page with error code 3005. I have tried using the sandbox on a development version of the site and this works fine.
The Magento site uses a secondary email address as the PayPal address and this all seems fine within the verified PayPal account.
Do you have any ideas on why this may be failing.

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On reaching Shopify support I was told to contact Paypal to resolve this. Now my customers have no option to make any payments. after clicking on "Activate Paypal Express Checkout" button on shopify payment providers page, it asked for paypal email address. I added new paypal email address which I already added on my paypal account. After that it asked to login. I logged in. Nothing changed on Shopify. the paypal checkout is not integrated on my website.
when I added my primary account for the first time, it worked. But that was my personal email. So now I created new one under my domain and added. Then I deactivated that old email which I integrated with shopify and tried to activate new one. but it is not working this change is happening on Paypal urls not Shopify. That is the reason they told me to contact you.
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When I am trying to sign up for website payments pro in the sandbox, I get redirected to the live paypal site.
I have seen the same question asked here: Signing up for website payments pro in paypal sandbox redirects to live paypal site
where the it seems that the account is already running payments pro. However on my business setup>>my payment solution it says i am running payments standard.
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There are some issues that are still being addressed in the sandbox with some pages directing to the live site. Can you provide the email address for your test sandbox seller account and I will enable pro on the account from my end.