I have the same problem and trying to resolve now with Schwab. Note that I am not in the USA, I have a non-USA address and, as a result, my account is managed by Schwab Intl (and not Schwab USA). In my opinion, the issue is NOT a technology issue (it has nothing to do with IP address, VPN, browser, account names, etc). I know this because someone else in my household uses my same laptop and has no problem importing from their Schwab USA account directly into TT. Whereas I get the same msg as you, "select at least one account". I think the issues is how Schwab Intl sets my account - likely to do with a flag dis-enabling the ability to share with third-parties (even though, in my account profile, the ability is enabled). Separately, while I wait, I downloaded tax pdf forms from Schwab; however, I am only able to upload 1099INT and DIV into TT. I am unable to upload 1099B (which is the most complicated) because TT does not seem to have the option to upload for Shares (only for INT and DIV). I will post here if there is a resolution
