Cannot log into plugin

Hi.

We are running Version 1.4.3 of the Pardot plugin. I’m getting the same Cannot authenticate. Please check the fields below and click “Save Settings” again. as everyone else. It seemed to come on overnight, as the forms were working on the site until 9:36pm last night.

I’ve tried the fixes on the rest of the threads, resetting the password, setting up a new user etc.

We don’t use IP whitelisting so it’s not that. Any other ideas of what I can try to fix this? All the forms are currently down on the site- and we have a lot of forms!

Thanks,

Joey