What should be easy at least as a bypass, is to add the following to your LootProtect.json:
"Rules": {
"button": false,
So, under the existing Rules section, add "button" with value false (no quotes). This should prevent the plugin from blocking access.
You can also, as admin, run "/lp log" from chat to enable logging, then check the server log while accessing the button before and after the change.
You could also try setting the value in LootProtect.json to true and see if that lets you manage access via /share.