Very disappointing to find this thread with no solutions. I use Opera and Vivaldi. Getting the error on both. Tried switching to a VPN connection and still getting same error on both browsers.
First time I've used online Turbo Tax. Sure missing the downloaded version.
EDIT: Just tried Firefox on my laptop with internet connection supplied by a hotspot. Same result.
And for anyone thinking of suggesting I go back to downloaded version, I pay for Quickbooks SE and filing taxes online is part of what I'm paying for.
