telethon.TelegramClient not working when calling from Dash callback - telegram

Question

I am kind of a newbie with dash and I try to call a function that creates a telethon TelegramClient instance and send a message when triggerd by a Dash callback, but it looks like the line
client = TelegramClient(phone_number, api, hash)
is running forever without any error message
but when I run from outside the dash app just as python script it work fine..
does anyone have an idea to make it work ?
Here is my code :
helper.py :
layout = html.Div(
[
html.Div(
dbc.NavbarSimple(
children=[
dbc.NavItem(dbc.NavLink("Telegram User and Localisation", href='/telegram-exp')),
dbc.DropdownMenu(
children=[
dbc.DropdownMenuItem("More pages", header=True),
],
nav=True,
in_navbar=True,
label="Tools"
),
],
brand='test',
color='primary',
dark=True
)
),
dbc.Row(
[
dbc.Col(html.Div(
[
dbc.Input(
id='message',
placeholder='message',
n_submit=0,
),
html.P(id='text'),
],
)),
]
),
]
)
#app.callback(
Output('text', 'data'),
Input('message', 'n_submit'),
State('message', 'value'),
prevent_initial_callback=True
)
def update_loc(inpt, stat):
return send_message(stat)
send.py
def send_message(msg):
client = TelegramClient(phone_number, api_ID, API_hash)
async def main():
await client.send_message('me', msg)
return msg
with client:
client.loop.run_until_complete(main())
I change the code to be more generic but the main question is why TelegramClient running for ever without any error message, and how to solve it..
Thanks