Apps Script turn value between functions - google-apps-script

Question

Hello everyone)) I have problem with moving value inside th function, please help me
First I have field "allValid" - has taken boolean value "true".
Next I did 3 checking breakpoints in script where this field must change boolean value on "false".
But whatever i do allValid always has "true". I cant understand what am I doing wrong.
function ButtonClickAction(){
let allValid = true;
var UserInfo = {};
UserInfo.zLOGIN = document.getElementById("LOGIN").value;
UserInfo.zSSCC = document.getElementById("SSCC").value;
UserInfo.zPLACE = document.getElementById("PLACE").value;
var toValidate = {
LOGIN: "LOGIN REQUIRED",
SSCC: "SSCC REQUIRED",
PLACE: "PLACE REQUIRED"
}
var idKeys = Object.keys(toValidate);
//first checking
idKeys.forEach(function(id){
isValid = checkIfValid(id,toValidate[id]);
allValid = isValid;
});
//second checking
google.script.run.withSuccessHandler(onLOGIN).searchLogins(UserInfo);
function onLOGIN(findLogin) {
if (!findLogin) {
alert("LOGIN NOT EXIST");
allValid = false;
}
}
//thirdchecking
console.log(allValid);
google.script.run.withSuccessHandler(onSSCC).searchSSCC(UserInfo);
function onSSCC(findSSCC) {
if (!findSSCC) {
alert("SSCC NOT EXIST");
allValid = false;
}
}
//finish result
if (!allValid){
alert("YOU HAVE NOTHING");
}
else {
addRecord(idElem);
}
}
function checkIfValid(elId, message){
var isValid = document.getElementById(elId).checkValidity();
if(!isValid){
alert(message);
return false;
}
return true;
}
At the end of the function "ButtonClickAction" I have "finish result", but it works wrong because allValid has always "true". Help!
(sorry for bad English, it's my non-native language, I try explain correctly)
... and some server code:
var url = "https://docs.google.com/spreadsheets/d/1s8l-8N8dI-GGJi_mmYs2f_88VBcnzWfv3YHgk1HvIh0/edit?usp=sharing";
var sprSRCH = SpreadsheetApp.openByUrl(url);
let sheetSRCHSSCC = sprSRCH.getSheetByName("PUTAWAY_TO");
let sheetTSD = sprSRCH.getSheetByName("ПРИВЯЗКА МЕСТ");
function searchLogins(UserInfo){
let sheetSRCHLGN = sprSRCH.getSheetByName("ЛОГИНЫ");
let findingRLGN = sheetSRCHLGN.getRange("A:A").getValues();
let valToFind = UserInfo.zLOGIN;
for (let i = 0; i < findingRLGN.length; i++){
if(findingRLGN[i].indexOf(valToFind)!==-1){
return true;
}
};
return false;
}
function searchSSCC(UserInfo){
let findingRSSCC = sheetSRCHSSCC.getRange("M:M").getValues();
let valToFind = UserInfo.zSSCС;
for (let i = 0; i < findingRSSCC.length; i++){
if(findingRSSCC[i].indexOf(valToFind)!==-1){
return true;
break;
}
};
indx=2;
return false;
}