If you are configuring replication task from your EventHub using the
Tasks / Add a task option in Azure Portal:

You probably experienced some issues with the Logic App that was created automatically.

It turns out the Logic App is created with some funky configuration... which is perhaps caused by the fact it's still in preview?

It will be running on V3 which is no longer supported, and before you do anything else, you have to update a couple of settings.

Settings / Environment variables

These changes migrate your Azure Function from V3 to V4, but you still need to update the .NET Frameworks version. Save your changes and move to the Configuration.

Settings / Configuration / General settings

You will have two options here: .NET 6 and .NET 8. Since .NET 6 is already deprecated, I'm using .NET 8.

For a reference of all configuration options, see Reference for app settings - local.settings.json