This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Sitecore

Facing an issue that after setting up Fresh Sitecore Instance, not able to access local instance.
getting issue as below

and Config error as 

This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".


To resolve this issue,

Please update below setting as per screenshot

1. Windows search -  "Turn Windows Features on or off"

2. Expand ASP.NET 4.5 advanced services > WCF section

3. Check HTTP Activation.

4. You'll be asked to restart the system.

Hope this will help.

An item with the same key has already been added Sitecore EXM

If you are using Sitecore EXM campaign on Form submit button, then you may be facing below issue on UI screen as 

Send Email Failed...

and if you will see Sitecore EXM log will get that error information as

Message: an item with the same key has already been added.


To overcome with this issue, would suggest to go back on the Form Builder and ensure that all form Fields name are unique, and if not then please update will started working.

Hope above tips will help to resolve this issue.