Help request

Problem

I have installed this plugin on my aternos server and only admins can open their backpacks, how do I fix it?
What I have tried

I added these permission to groups/default on luckperms:
backpack
backpack.use
backpack.sort
backpack.size.3
backpack.keepondeath

can you just make the plugin be usable for players who don't have permissions? like I watched some YouTube videos about this plugin and I did everything they said I don't know why it doesn't work I literally gave players those permissions and that doesn't work

and also don't look at my name

You can try this.
Since it is most likely an issue with how you have set up luckperms please share your luckperms config.

config.yml.txt
and also in aternos there is no permissions.yml or maybe it's hidden but I can't access it

well I guess I will not be using this plugin for now