More info on the new TDAmeritrade login, in case it is useful.
Previously you would have entered your TDA login in xlq preferences under data source specific TDAmeritrade, and you continue to do so, but now instead of entering the details there you click a link to open a browser window to do so i.e.
As you can see you have 2 options. Click the … button after selecting “secure login”, or click “open signin window”.
On doing so you get this
Login and you get this
Click allow and you are good for 3 months. Xlq does not display balances, move money etc as it does not access those services, just retrieves market data.