to create gtt order

if i use hardcoded access token then it works fine,
but if i make dynamic to get access token, i get invalid token error..

Response data for NSE:IRCTC: {'success': False, 'message': 'Invalid Token', 'errorCode': 'AG8001', 'data': ''}

this
headers = {
'Authorization': f'Bearer {authToken}'

is the problematic part..

pls someone help me

my client id is P122800