[GNC] USAA OFX Direct Connect stopped working

[John Haiducek]

Downloading transactions from USAA accounts stopped working for me today.
In the past I've been able to restore access by following the instructions
at https://wiki.gnucash.org/wiki/OFX_Direct_Connect_Bank_Settings#USAA and
getting an accessid from http://usaa.com/accessid or
https://df3cx-services.1fsapi.com/casm/usaa/enroll. However, now both of
those websites redirect to a page that returns the following in JSON:

{
"error": "invalid_request",
"error_description": "Validation error"
}

Does anyone know a workaround for this? Is there an updated URL I can use?