sandbox - unable to subscribe

[BoredGuy]

Hello,

I have a paypal button that loads the payment window. that part works but when i try to subscribe using my test account it fails with this message:

"Sorry, we couldn't set up your subscription using the payment method you selected. Please try another payment method."

I tried the credit card on the account that also returns the same message.

Anyone have any ideas how to test buying a subscription?

[Qroft]

I have read somewhere that you must confirm the sandbox user emails.

But this does not seem to work for me.