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Hi @Oyeladun Ayobami,
From the error message, we can find you are using IIS web server. So we can follow the suggestions from the error message, and enable customErrors to find more details.
If you are using azure app service, you can click Diagnose and solve problems in the left panel in azure portal, the try to check Application Event.
And I am guessing the issue should be related to DBConnection String, please check the logs and share with us.
Best Regards
Jason
How locate Web.config file
The web.config file is located in the application's root folder on IIS and the project root folder in Visual Studio.
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you appear to be using asp.net core. the web.config is created during publish if not in the project. copy the web.config from the publish folder to the project root folder. mark its build option to copy. then you can edit as suggested.