To resolve this issue, you can try the following steps:
Verify the Azure DevOps service connection: Double-check that the Azure DevOps service connection you created has the correct permissions and is properly configured. Ensure that the service connection has the necessary access to your Azure subscription, Function App, and repository.
Check the associated identity: Review the service principal or user account associated with the Azure DevOps service connection. Make sure it has the required permissions and is correctly linked to the DevOps organization and repository.
Validate permissions: Ensure that the associated identity has sufficient permissions to access and deploy to the Function App. Verify that it has the necessary Contributor or Owner role at the Function App level or appropriate access control at the resource group or subscription level.
Retry the setup: After confirming the above steps, try setting up the continuous deployment again. Make sure to select the correct repository and Azure DevOps service connection during the configuration process.
If the issue persists after following these steps, it would be helpful to review the detailed logs and diagnostics provided by Azure to gather more specific information about the error.