Remote Event does not work with Proximity prompt

[simple marsh]

you're calling fire server from the server

if you want to fire from server to client you do :FireClient(Player)

[graceful path]

To fire server use a localscript

-- LocalScript
local part = script.Parent
local prompt = script.Parent.ProximityPrompt
local promptjob = game:GetService("ProximityPromptService")

prompt.Triggered:Connect(function()
    game.ReplicatedStorage.cutsceneone:FireServer()
end)

To fire client use a normal script as Izan990 said (remember to define player):

-- Script
local part = script.Parent
local prompt = script.Parent.ProximityPrompt
local promptjob = game:GetService("ProximityPromptService")

prompt.Triggered:Connect(function()
    game.ReplicatedStorage.cutsceneone:FireClient(player)
end)

[simple marsh]

Triggered pass the player

prompt.Triggered:Connect(function(player: Player)
game.ReplicatedStorage.cutsceneone:FireClient(player)
end)

[graceful path]

You can use this for fancy formatting like my messages:

What error?

If you're catching the event in a server script you want to check for OnServerEvent.

What are you trying to do?

[orchid lagoon]

** You are now Level 1! **

[graceful path]

You'll need 2 scripts for that, one on the server and one on the client.

The localscript script will look like this:

-- Localscript
local part = script.Parent
local prompt = script.Parent.ProximityPrompt
local promptjob = game:GetService("ProximityPromptService")

prompt.Triggered:Connect(function()
    game.ReplicatedStorage.cutsceneone:FireServer()
end)

And the server script will look like this:

-- Script
game.ReplicatedStorage.cutsceneone.OnServerEvent:Connect(function(player)
  print(player) -- Example of printing the player who used the proximity prompt.
end)

For the reverse you would use this in the server script:

-- Script
local part = script.Parent
local prompt = script.Parent.ProximityPrompt
local promptjob = game:GetService("ProximityPromptService")

prompt.Triggered:Connect(function(player)
    game.ReplicatedStorage.cutsceneone:FireClient(player)
end)

And this in the localscript:

game.ReplicatedStorage.cutsceneone.OnClientEvent:Connect(function()
  print(player) -- Example of printing the player who used the proximity prompt.
end)

Which one?

Could you show me the code you used and an image of the scripts in the explorer?