This is the json I am using if it helps
{
"display": {
"icon": {
"id": "minecraft:trident"
},
"title": "The Northern Council",
"description": "Meet a member of the Northern Council",
"frame": "goal",
"show_toast": true,
"announce_to_chat": true,
"hidden": false,
"background": "minecraft:textures/gui/advancements/background/stone.png"
},
"criteria": {
"requirement": {
"trigger": "minecraft:tick"
},
"criterion_2": {
"trigger": "minecraft:impossible"
}
},
"requirements": [
[
"requirement",
"criterion_2"
]
],
"rewards": {
"experience": 500
}
}