I’m not familiar with that plugin, but I’ve had a look at the devforum post about it, and it doesn’t seem that the plugin utilises the plugin toolbar. If it is just that particular plugin that isn’t working, I suspect that that is why.
If you followed the instructions outlined in the linked post above and it doesn’t connect to Discord how you would expect, I would recommend replying to the linked post or directly messaging the creator of the plugin.
Hey there, @SeargentAUS is correct. StudioPresence doesn’t need any plugin toolbar because all it does is send http calls and there’s not really a use for it. By default, the plugin will always work as long as you have the server enabled on your desktop.