It's possible they no longer allow ACH. IIRC the option was only presented after I selected can't find my bank and then selected cancel. At that point I'm pretty sure it presented a page with ACH and routing. But it's been a minute and I have no way to step through since our order is complete.
EDIT here is a link that might either prove helpful ... or out of date
I recently used Plaid to pay the final balance on my 21 M3 LR. I was not going to give Plaid my banking credentials (user name and password) but found a work-around that uses the usual ACH info. You can close the "select your bank" dialog box, using the X in the upper right corner. You'll be...
teslamotorsclub.com