The best approach is to troubleshoot the problem step by step. Start by verifying your FamilySearch Login credentials and internet connection. Confirm that your account works independently, then check your Family Tree Maker version and account connection settings. Write down the exact error message and the steps that caused it to appear. Avoid deleting or modifying genealogy data while investigating the login issue. If your FTM project contains years of research, make a backup before making major changes. A structured troubleshooting process can help identify whether the problem is related to the account, connection, software, or authorization.