If you receive the message "This SharePoint site hasn't been shared with you", follow these steps. Please note that your screen may look slightly different depending on what internet browser you're using (i.e. Google Chrome, Internet Explorer, Edge, etc.).
Step 1: Click here to access the internal site
Step 2: Select "Sign in as a Different User"
Step 3: Choose "Windows Authentication" when prompted for credentials
Step 4: Choose "Use another account"
Step 5: Log in using "ACCOUNTS\yourUsername" as your username. This is the IAM account you use in STAR.
Including ACCOUNTS\ before your username is needed because your agency may have multiple domains. This problem occurs at DHS, DNR, DOT, and DWD, but may occur in other agencies as well.