It's not working for anyone, there's a few of us in this thread that have also posted about this problem:

https://quickbooks.intuit.com/learn-support/en-au/other-questions/re-tansactions-have-not-loaded-for...

Quickbooks seem to be using the URL: https://www.28degreescard.com.au/ .. but 28 Degrees changed the web banking URL to https://28degrees-online.latitudefinancial.com.au/access/login a while ago, so it makes me wonder if Quickbooks need to update their code.

Quickbooks support staff will tell you to upload the transactions manually using the CSV method, but unfortunately 28 Degrees doesn't support exporting transactions to CSV.  It's a total pain and I'm now looking at changing credit cards because Quickbooks haven't been able to sort this problem in 6 weeks.