How to make a variable available for all the functions of my routes.py file in Flask Python?

Question

I am building a web app with Flask. It is the dashboard of my marketing software. In my marketing software, user can create some campaigns.

Once the user is logged in, I get his campaigns ids and store them in a cookie.

PROBLEM:

The list of campaigns are not showing if user block the cookies.

So I am trying to find an alternative solution

WHAT I TRY:

I tried to store the values of the user in some global variables. I was hoping the other routes could have access to the values of these global variables.

This is a sample of my routes.py:

def create_global_variable():
    global global_variable # must declare it to be a global first
    # modifications are thus reflected on the module's global scope
    global license_id
    global email_license_ok
    global product_id
    global campaigns
    global id_campaign
    license_id =""
    email_license_ok  =""
    product_id =""
    campaigns = ""
    id_campaign = ""

create_global_variable()


@app.route('/login', methods=['GET', 'POST'])
def login():
                email_license_ok, license_id, product_id = check_email_license(user.user_email, form.licensekey.data)
                print(f"""
                ********************** LOGIN SUCCESS ********************************
                user.user_email : {user.user_email}
                form.licensekey.data : {form.licensekey.data}
                license_id : {license_id}
                email_license_ok :{email_license_ok}
                product_id : {product_id}
                """)
                if email_license_ok:
                    login_user(user, remember=form.remember.data)
                    next_page = request.args.get('next')
                    flash('Login successful!', 'success')
                    cookies = request.cookies
                    res = make_response(redirect(next_page) if next_page else redirect(url_for('dashboard')))
                    res.set_cookie("license_id", str(license_id))
                    res.set_cookie("product_id", str(product_id))
                    print(f"form.licensekey.data : {form.licensekey.data}")
                    return res

# The route to show campaigns's user
@app.route('/campaigns')
@login_required
def campaigns():
    """
    This is the list of campaigns page
    """
    # [ COOKIES ] -------------------------------------------------------------

    page_campaigns_cookie = 1
    cookies = request.cookies
    #license_id = cookies.get("license_id")

    if cookies.get("page_campaigns") and cookies.get("page_campaigns") != None:
        page_campaigns_cookie = cookies.get("page_campaigns")
        
    # ---------------------------------------------------------------------------
    # ---------------------------------------------------------------------------

    # [ ARGUMENTS IN URL ] ------------------------------------------------------
    args = request.args
    #email_license_ok, license_id, product_id = check_email_license(user.user_email, form.licensekey.data)
    print(f"""
    ********************** route /campaigns *******************************************
    args : {args}
    license_id : {license_id}
    email_license_ok :{email_license_ok}
    product_id : {product_id}
    """)

When I simulate login and click on "Campaigns" I get this log:

********************** route /campaigns *******************************************
args : ImmutableMultiDict([])
license_id :
email_license_ok :
product_id :

As you can see, my global variables are empty. It didn't work.

How to make a variable available for all the functions of my routes.py file in Flask Python?