I have the same issue with Business 2019 running on Win10 in VMware on a Mac running 10.15.4. I've tried all of the suggestions here (changed browsers, deleted cookies, etc.) and even turned off all the firewalls and AV. TT is able to check for updates, so internet and firewalls are working. Since updates to TurboTax work, it must be a protocol unique to the transmit-returns function or a bug. Why hasn't Intuit figured out what their problem is?
