Not sure what you are trying to do on the PayPal site. Please explain.
To call TurboTax customer support
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number
Customer support is available from 5 a.m. to 9 p.m. Pacific time daily
When PayPal is selected for payment, a popup window opens to your linked account. After it processes, the popup closes but the only active buttons are Back and Update which reloads the page. There is no way to checkout.
Contact support during business hours Monday - Friday for help with this.