Quicken has given me a coupon for 100GB of free Dropbox space. In the notice, they directed me to navigate to https://www.dropbox.com/coupon and to enter the code they've provided.
I believe these were the steps I took:
I navigated to that URL, entered the code and clicked Submit. I landed on the "login" page and selected the Google login method. I successfully logged in, but see that my storage is still ~7GB, and the 100GB did not apply. When I go to redeem the coupon again (by doing the same steps but now already being logged in), I get an error stating, "The code you entered has already been used."
Apparently this is the only way I can get in contact with Dropbox support. Please reach out to me. Thank you.