Good news, I can confirm today as of 3/5/2022 6pm PDT that connecting to Schwab works BUT that you have to repeatedly try. I tried for about 10 minutes off and on, then 30 seconds of repeated attempts and FINALLY it worked without the "Login is temporarily unavailable. Please try again later or call customer support."
So, repeatedly try for a few minutes.
The bad news is, I owe even more taxes than I thought I would. :(
