Can we get the UUID of Groups in Appian via any function or plugins in an expression rule.
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You can use the People Functions plugin for this. People Functions has a lot of useful functions including the one you're looking for called getgroupuuid(). Hope this helps!
You can use the getgroupuuid() function, which is included in the People Function plugin.https://community.appian.com/b/appmarket/posts/people-functions---plug-in
getgroupuuid( group:Replace_This_With_GroupId )