I've got the same issue. We have just changed account owners on our Shopify store and deactivated the old PayPal account, but now I can't reactivate PayPal again. I click on Settings > Payment Providers > Activate PayPal Express Checkout. From there I can successfully log on to my PayPal business account. It loads a page titled 'Allow PayPal to connect your account with Shopify', I click 'Agree and Connect', but then the page times out and cannot redirect. The URL (in Chrome) is paypal.com/bizsignup/redirectEntry?status=SUCCESS&statusCode=VERIFIED I have tried different browsers and devices with the same problem. I have logged in to my PayPal account, it seems it is setting the permissions correctly but just can't get back to Shopify. I have been trying for a few days now but still no success.
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