I tried again. This time I got to the Schwab login page. After login and agreeing to terms, etc, I received the following:
Something unexpected happened and we can’t connect to Charles Schwab & Co., Inc..
Try again in a few hours. (590)
I'm wondering if the too-many requests errors pertains to connecting to Schwab. I suspect that Schwab may be unable to handle the volume (or maybe the intuit server can't handle the volume. I'll try later as suggested.
Schwab moved headquarters to Texas. Ever since, service has degraded. This seems to be common of organizations that move home offices like Boeing
