Yoda Response: Complex coding problem, implementing MSAL for secure user authentication, it was. Approach, detailed, I shall describe.

First, integrated the MSAL library into the Android project, I did. Configured the authentication parameters in the Azure portal, I did. Client ID and redirect URI, obtained from Azure, they were.

Next, in the application, initialized the PublicClientApplication object, I did. Used this object to handle authentication requests, I did. For user login, called the acquireToken method, I did. Handled the result in the callback, ensuring successful authentication, I did.

For secure token acquisition and renewal, implemented token caching, I did. Ensured tokens were refreshed before expiration, I did. Securely stored tokens using encrypted shared preferences, I did.

Thoroughly tested the implementation, I did. Ensured secure and seamless user authentication, it was. Complex problem, solved with careful planning and execution, it was.