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Paypal Sandbox stuck at logging in loading issue

See original GitHub issue

Description

Please provide a short description of the issue here, along with: We are in Paypal Sandbox on clicking pay with paypal the screen does not go past the loading paypal login one.

Screenshots or videos that show the issue
Your code Node/Express APIs


//Create Payment
axios
    .post(
      `https://api.sandbox.paypal.com/v1/payments/payment`,
      {
        intent: 'sale',
        payer: {
          payment_method: 'paypal'
        },
        transactions: [
          {
            amount: {
              total: amount,
              currency: currency
            }
          }
        ],
        redirect_urls: {
          return_url: '<Our Redirect URL>',
          cancel_url: '<Our Cancel URL>'
        }
      },
      {
        headers: {
          'Access-Control-Allow-Credentials': true
        },
        auth: {
          username: PAYPAL_CLIENT_ID,
          password: PAYPAL_SECRET
        }
      }
    )
    .then(({ data }) => {
     // Get and Store paymentID
    })

//Execute Payment: 
axios
    .post(
      `https://api.sandbox.paypal.com/v1/payments/payment/${paymentID}/execute`,
      {
        payer_id: payerID
      },
      {
        headers: {
          'Access-Control-Allow-Credentials': true
        },
        auth: {
          username: PAYPAL_CLIENT_ID,
          password: PAYPAL_SECRET
        }
      }
    )
    .then(async () => {
      res.send({ status: 'success' })
    })

The paypal.version from your browser console “4.0.309”
The exact browser version Chrome Version 79.0.3945.130 (Official Build) (64-bit)
All console logs during the time of the issue, especially error messages The page with paypal login window does not load. No error messages on that windows console. In the original window: Request to post /create-payment failed with 504 error. Correlation id: unknown
Does the issue also occur at developer.paypal.com/demo/checkout?
Does the issue occur consistently, or intermittently? intermittently - works 1 in 5 times.