AzureWebJobsDashboard connection string

Connecting to an existing storage account that has only blob storage didn’t work, and I got the following (unhelpful) error message:

Failed to connect with the accountname storage account using credentials provided in the connection string.
In your Microsoft Azure Website configuration you must set a connection string named AzureWebJobsDashboard by using the following format DefaultEndpointsProtocol=https;AccountName=NAME;AccountKey=KEY pointing to the Microsoft Azure Storage account where the Microsoft Azure WebJobs Runtime logs are stored.

Solution: use a new general purpose storage account.