After you got the DCU loan with the 1.24% rate (that you obviously didn't docusign it), did you have your SA switch your payment option back to Tesla Financing and then fill out the application on the website? Then once you were approved, did you then send the email & copy of the DCU loan to ratematch@tesla asking them to match the rate?
This is what I was planning on doing, but just wanted to make sure that it goes seamless.
BTW, to the other person asking about how long it takes to setup your DCU account and loan, if you have extra time (like I do now), setup the free checking account now and sign up for the Schools membership program for $10 now, as that all may take a couple of days to finalize. Within a week, you'll have a new debit card and PIN from DCU in the mail, and you will be able to log into your account online as soon as your checking account has been verified and setup (usually the next day after you open it up).
This way when you go to apply for an auto loan through your account, most of your info is already there and pre-filled out and it'll save you time when applying and waiting on the approval since you will already be a member.