unable to run locally with application credentials

[dremsol]

I've tested my application credentials with Curl and these are working but somehow this repository doesn't accept them anymore when running locally.

#!/bin/bash

set -a; source ./app/.env; set +a

python manage.py runserver

.env is structured as

HOST_ENVIRONMENT=eu1
MDSP_KEY_STORE_CLIENT_ID=secret_client_id
MDSP_KEY_STORE_CLIENT_SECRET=abcdefghijklmnopqr
MDSP_HOST_TENANT=siemens2
MDSP_USER_TENANT=siemens
MDSP_OS_VM_APP_NAME=cli
MDSP_OS_VM_APP_VERSION=v1.0.0