@Rizwan Ali Thanks for reaching out. Could you please check the function app's status in the Azure portal to make sure that it is running. If the function app is stopped, start it and try triggering the functions again.
Navigate to your function app in the Azure portal and select Diagnose and solve problems to open Azure Functions diagnostics to troubleshoot further please refer: https://learn.microsoft.com/en-us/azure/azure-functions/functions-diagnostics
please try and let me know if this helps.