Error "Failed to send notification. Cannot retrieve the Information for application credential key"

Document created by butlerj Support on Nov 29, 2018
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ISSUE
Workflows might fail with the following error: 

Failed to send notification. Cannot retrieve the Information for application credential key.

Additionally, email notifications are not sent and the People Picker control fails to resolve users.
ERROR CODE
RESOLUTION
Use the following PowerShell command to enter the username and password values for the People Picker:
PS C:\> STSADM.exe -o setproperty -pn peoplepicker-searchadforests -pv "forest:*YOURDOMAIN*,*USERPICKACCOUNT*,*USERPICKPASSWORD*" -url http://*YOURWEBAPPLICATION*

If the error persists, run the below commands:

PS C:\> stsadm -o setapppassword -password *USERPICKPASSWORD*  PS C:\> STSADM.exe -o setproperty -pn peoplepicker-searchadforests -pv "forest:*YOURDOMAIN*,*USERPICKACCOUNT*,*USERPIKPASSWORD*" -url http://*YOURWEBAPPLICATION*

Note: This is SharePoint configuration and should be approached with caution. For more information, see Configure People Picker in SharePoint 2013 in Microsoft TechNet.

ADDITIONAL INFORMATION
This is caused by a corruption in the SharePoint People Picker settings, possible due to the addition of WFE server or other change to the Farm config.
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