[Fizzlemizz]

tempSpellChatList = {
    addSpellLink = {
        percentage = 100,
        isEnabled = true,
        spellChatList = {}
    }
}

Not sure of your intention but when written like this, addSpellLink becomes the name of the key as in

tempSpellChatList = {
    ["addSpellLink"] = {
        percentage = 100,
        isEnabled = true,
        spellChatList = {}
    }
}

If you want to use the spell id as the key

tempSpellChatList = {}
tempSpellChatList[addSpellLink] = {
    percentage = 100,
    isEnabled = true,
    spellChatList = {}
}