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Justin EdelsteinJustin Edelstein 

Mention Community User on a Record via a Process

Has anyone successfully created a process builder that can @mention a community member on a record that the community member can see? The catch - the post itself is written by an internal user based on the fact that it’s kicked off via a process and therefore automatically posts just to the record without any care for the channel in which it is posting making it invisible to the community user… 
Best Answer chosen by Justin Edelstein
Gaurav MalikGaurav Malik
I used flow (called through process builder):

User-added image

Target name or ID would be the record Id in your case.

You should be able to @mention the community user in the message.

All Answers

Gaurav MalikGaurav Malik
I used flow (called through process builder):

User-added image

Target name or ID would be the record Id in your case.

You should be able to @mention the community user in the message.
This was selected as the best answer
Justin EdelsteinJustin Edelstein
Thanks! This helped a lot! 
Justin EdelsteinJustin Edelstein
This help article helped quite a bit when figuring out what to use as inputs for each variable / parameter

https://help.salesforce.com/articleView?id=vpm_designer_elements_action_feed.htm&type=5