Azure App Deployment Issue: Troubleshooting 'Failed to Connect to Database' Error

I'm currently experiencing a persistent issue during the deployment of my application on Microsoft Azure. Specifically, I keep encountering a 'Failed to Connect to Database' error message. I have verified the connection string and ensured that the database credentials are correct. However, the error persists. I followed this https://learn.microsoft.com/en-us/training/paths/deploy-applications-with-azure-devops/ but wasn't of much help in my case. Most of my tasks were handled by their https://triotechsystems.com/devops/ team. But when I tried to handle the rest I got stuck here. Has anyone else faced a similar issue with app deployment on Azure where the connection to the database fails? What steps did you take to diagnose and resolve this problem? Any insights, specific troubleshooting techniques, or recommendations from the Apps on Azure community would be highly appreciated to help me overcome this 'Failed to Connect to Database' error and successfully deploy my application on Azure.

TIA