I have created a azure container with a function app with a queue trigger.
I have also configured a scaling rule with connection string

This connection string is defined in secrets as a base64 string of an actual connection string.
But I am getting following error in the system log of the revision.
"can't parse storage connection string. Missing key or name"
Any help how can I fix this issue?

There seems to be an issue with your connection string.
Function app=>Application settings=>configuration.Also, try using
AzureWebJobsStorageapp setting in your function with valid storage account connection string as its value.Check if you have all the required permissions to process the request.