@Anonymous I would suggest you to first verify whether there are binding defined in the function.json?
When you test your function locally are you observing the same issue or the issue is only observed once it is deployed using azure DevOps.
I will also suggest you to verify if there are any errors/exceptions that you observed in application insights for your function app. The other reason could be if you have missed defining the application setting for AzureWebJobsStorage. You can also try to sync function trigger and see if it helps you.