I'm using TT Premier desktop 2024 and had the exact same issue. I don't use VPN cuz it messes up my work connection, but in desperation (after trying compatibility mode; run as administrator; etc.) I turned VPN ON and it fixed the issue! Maybe in 2019 TT wasn't meant to go through VPN, but maybe they updated it and now it's required!! Very disheartening, but thanks for everyone who gave advice. And if you have the issue, try everything and something will work...I hope.
BTW, it seems like the problem was related to connecting to a Captcha website, rather than the financial institution, cuz the first thing it wanted me to do was prove I wasn't a robot -- well, no robot could have figured out you have to turn VPN on to get it to work.
