The reason for not being able to log into the CommBank app could be due to a temporary issue affecting some of their services, which was reported and fixed recently as of October 2, 2025. If the problem persists, it could be related to network connection issues, the app needing an update, or incorrect login credentials. Common troubleshooting steps include ensuring a stable internet connection, updating the app to the latest version, double-checking your username and password, restarting your device, or reinstalling the app. Additionally, CommBank has acknowledged recent outages that affected access to banking services, so there may be intermittent disruptions. If the app still won't let you log in after these steps, reaching out to CommBank support through the app's 24/7 messaging help or their customer support line is recommended for further assistance.