Any sandbox account works

[HelpTheDog]

Hello,
I'm trying to test a payment system with the sandbox, and any account works. I used the default ones, create new ones, and nothing.  It says all the time "Some of your information isn't correct. Please try again." Any hint to fix it?

[MTS_Justin]

Hello,

Check the URL which is shown in the address bar of your browser when attempting to login as the buyer and make the payment. If this doesn't start with "https://www.sandbox.paypal.com" then you won't be able to use a sandbox testing account to make the payment.

If the URL starts with "https://www.paypal.com", then you have reached our production site and only a production account can login and confirm / make the payment.

Thanks !