Is anyone also having issues with sign in and/or sync? Last week my coworker and I couldn't log in, then the next day it was fine. Today, I'm logged in but my campaigns are spinning, trying to sync.
Can you please share your account credentials in a private message on forums so that we can debug the login issue at our end. Also, Please refer the following article on trouble shooting Activity sync error issues.
Troubleshooting Activity Sync Error Issues in Adobe Target