Paypal button code not letting buyer login and pay

I am having some issues getting the custom paypal code injection to work completely on a website I am working on for a client. The code injection works until I try to test it and it wont let me sign into paypal when the dialog box appears. I know my username and password is correct, and I've even used another paypal account to login and that doesnt work either. I attached screenshots of what happens when I try to pay for a service. My squarespace is connected to paypal but I not using the checkout feature. I also have a business account. If anyone has any tips or knows what to do it would be greatly appreciated! Thank you!

I currently have the same issue. It worked 3 month ago and now not anymore as something blocks the popup window from paypal to come up to be able to login and pay...

Did you get the issue solved?

10 minutes ago, TanjaKibogo said:

It worked 3 month ago and now not anymore as something blocks the popup window

Do you have an ad blocker installed such as Adblock Plus?

not on my laptob and not on my phone. It doesnt work on any devices. I only noticed because potential customer texted me saying the paypal button doesnt work. 

See here: https://www.tanjakibogo.com/shop-tk/productivity-membership

10 hours ago, TanjaKibogo said:

It doesnt work on any devices.

I am unable to verify your issue.