I get no Error message in console...and everything Seeems to work...but no when i sync..the updates for the suffix don't take place in the game.

• /lp group default meta setprefix 100 &G[Player] followed after it said it set it to the context of global...i did /lp sync...logged out of minecraft and logged back in..still no change
• current version: 5.0.39
• Server type: Sponge Forge 1.12.2
• No other plugin.

Your issue is, that LP does not manage the chat whatsoever... You need a separate plugin for managing the chat (Nucleus is recommended for Sponge servers).
You can check if LP did its job, when the prefix is showing for a player when using /lp user <user> info

Also, if you're using a normal server and not a server network, then the sync command is pointless as it is meant to be used on server networks and not normal servers.

aah thanks

Your issue lacks information for us to actually help you solving it.
Please provide information like:

• Steps you took
• Your current configurations of LP (Share through https://hasteb.in and make sure to remove sensitive information like passwords)
• What is your server type?
• What other plugins do you use?