The error means that there is a mismatch between the tenant where your app is registered and where you have stated in either the application code or the portal that your application is registered. In your code for the application you need to set the tenant ID. This is generally located in either the web.config or the app settings. Then you need to register the application in the portal under the same tenant ID that you have set in your code. Also ensure that your application ID/client ID are matching on both sides and all of the values set in your app settings/web.config match what you have in the portal.
You can check the application that you are trying to access in Azure and confirm if identifier "https://sts.windows.net/15ae5d35-7d8f-430e-ae2c-2110572ff617/" is present in enterprise applications configuration. If not, you can add this for the application in Enterprise applications >> select application >> single sign on >> Identifiers
Let me know if you have any furthers questions.
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