What are you trying to do?

I want placeholders to work for me

What have you tried so far?

Nothing, I don't know

Platform

• Server version (output of /version): 1.16.5 - R0.1 - snapshot
• Chest Commands version (check with /cc): 4.0.3

Additional context

Other placeholders working well, but placeholders from plan not...
Can you help me please?

I don't know what plan is, but if other placeholders work that's not Chest Commands' fault. Try asking the author of that plugin.