I've got the same problem.
Followed instructions on:
https://learn.microsoft.com/en-gb/training/modules/execute-azure-function-with-triggers/4-create-timer-trigger?pivots=csharp
Problem appears when I want to examine the log and Azure tells me to configure Application Insights.
When applying the default configuration in the sandbox the following error message appears:
Resource group 'DefaultResourceGroup-WEU' could not be found. (Code: ResourceGroupNotFound)