Sign-in & Login Problems

Fix Project Online to Roadmap Sign-In Error e.ToLowerCase Not Found

Huma Ashraf Ch Oct 1, 2026 869 views

Question details

Users need to resolve an authentication error that prevents them from linking Microsoft Project Online to their Roadmap.

How to Fix Project Online to Roadmap Sign-In Error

Product: Microsoft Project Online
Device & OS: not provided
Scenario: Attempting to sign in and link Microsoft Project Online to an existing Roadmap.
Observed behavior: The sign-in process fails, displaying an 'e.ToLowerCase Not Found' script or authentication error.

Before you start

Ensure you have active internet connectivity and your Microsoft 365 account credentials ready before troubleshooting the authentication process.

Solution 1Recommended

Test Connection Across Different Browsers and Devices

Isolate the authentication issue to determine if it is caused by the Microsoft service, your browser, or your local hybrid Active Directory environment.

Authentication errors like 'e.ToLowerCase not found' often stem from corrupted session data, browser extension conflicts, or specific device configurations blocking the login script.

Open an incognito or private window

Launch a private browsing window (e.g., Ctrl+Shift+N in Chrome or Edge) to ensure no cached data or extensions interfere with the sign-in.

Test in an alternative browser

Switch to a completely different supported browser, such as moving from Google Chrome to Mozilla Firefox, and attempt to link Project Online to Roadmap.

Log in from a different device

Use another computer or mobile device connected to a different network to see if the sign-in succeeds, which would point to a local machine or network configuration issue.

Test Connection Across Different Browsers and Devices

Environment Check: If the connection works on another device, you may need to clear your primary device's cache or consult your IT admin regarding your hybrid Active Directory settings.

Solution 2

Clear Browser Cache and Cookies

Remove stored site data that may be passing corrupted login tokens to the Microsoft Project Online service.

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Frequently Asked Questions

What does the 'e.ToLowerCase not found' error mean?

This is typically a JavaScript execution error that occurs in the browser during the authentication redirect. It often points to a glitch in the Microsoft login page script, conflicting browser data, or an unsupported browser environment.

Can my company's Active Directory settings cause Roadmap sign-in failures?

Yes. If your organization uses a hybrid Active Directory environment, synchronization delays or strict conditional access policies might block the seamless sign-in required to link Project Online to a Roadmap.

Which browsers are officially supported for Microsoft Project Online?

Microsoft recommends using the latest versions of Microsoft Edge, Google Chrome, Mozilla Firefox, or Apple Safari to ensure full compatibility with Project Online features and authentication scripts.

Login & Account Issues