Blank string when use Join Dictionary Values

I am trying to get a string of SP group members' names and I am using two actions: Get members from SharePoint Group and Joint Dictionary values. The workflow runs, but the string is blank:
10-23-2020 12-15-51 AM
I already used different combinations of (0) or ({0}) and /ImnName, /Name, /DisplayName, still nothing in the string. Could you please tell me what I am doing wrong?

Sorry, my bad: LoginName gave me values :slight_smile:

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