How can I get my returning value from a function in GlobalContext?

I have two functions, one is GetUsers(), other one is GetDiscussion() in GlobalContextManager.js

In MainScreen.js I can get returning value from GetUsers(), but i cant get value from GetDiscussion()

Here is GlobalContextManager.js

    import React, { createContext, useContext, useState } from 'react';
    import HorizontalCircles from "../components/HorizontalDiscussion";
    import HorizontalDiscussion from "../components/HorizontalDiscussion";
    
    
    export const GlobalContext = createContext();
    
    function GlobalContextManager(props) {
    
      const GetUsers = () => {
        const returnFromService = {
          "errorCode": -1,
          "data": {
            "colors": [
              {
                colorFirst:"red",
                colorSecond:"black",
              },
              {
                colorFirst:"pink",
                colorSecond:"gray",
              }
            ]
          }
        }; 
    
        if (returnFromService.errorCode === -1) {
          const returnFromGlobal = returnFromService.data.colors;
          return returnFromGlobal;
        } else {
          return returnFromService.errorCode;
        }
      }
    
      const GetDiscussion = () => {
        const returnFromService = {
          "errorCode": -1,
          "data": {
            "cards": [
              {
                "isLive": true,
                "type": "Topic",
                "title": "Human Resources Analysis",
                "author": "Emran Emon",
                "attendees": 12,
                "color": "#FFF9F2",
                "circles": [
                  "white",
                  "yellow",
                  "red",
                  "gray"
                ],
                "attendeesColor": "pink"
              },
              {
                "isLive": false,
                "type": "Topic",
                "title": "React Native Course UI",
                "author": "Matias Delgado",
                "attendees": 12,
                "color": "#E7FBFF",
                "circles": [
                  "white",
                  "yellow",
                  "red",
                  "gray"
                ],
                "attendeesColor": "pink"
              }
            ]
          }
        }
      }
    
      if (returnFromService.errorCode === -1) {


const returnFromGlobal = returnFromService.data.cards;

        return returnFromGlobal;
      } else {
        return returnFromService.errorCode;
      }
    
     
    
      return (
        <GlobalContext.Provider value={{ GetUsers, GetDiscussion }}>
          {props.children}
        </GlobalContext.Provider>
      );
    }
    
    export default GlobalContextManager;

Here is related part in MainScreen.js

import { GlobalContext } from '../../context/GlobalContextManager';
const MainScreen = ({ navigation }) => {
  const global = useContext(GlobalContext);

  const getUsers = () => {

    console.log("users from global:",global.GetUsers());

    const g_users =  global.GetUsers();
    const tmpUsers = g_users.map((a,index) =>  <HorizontalCircles key={index} colorFirst={a.colorFirst} colorSecond={a.colorSecond} />)
    
    setTimeout(() => {
      setUsers(tmpUsers);
    }, 5000);

  }

const getDiscussion = () => {
    console.log("Getting Discussion Card")
    const g_discussion = global.GetDiscussion();
    const tmpHorizontal = g_discussion.map((a, index) => <HorizontalDiscussion key={index} color={a.color} /> )

    setTimeout(() => {
      setHorizontalDiscussion(tmpHorizontal);
    }, 3000);

  }

The first function works, but the other doesnt. It says "can't find variable:returnFromService" for the second one. I thought it would work if i changed this variable name because i used it in first function, but it still didnt work.