Unable to provision token to InfluxDB from docker compose

Grafana InfluxDB
,
1

I have two datasources pointing at the same InfluxDB, one using InfluxQL and one using FLUX.
InfluxQL datasource verifies okay when pressing Save&Test in Grafana/DataSources. The FLUX shows a red exclamation mark with the text: Error reading InfluxDB.

When I copy/paste myToken into the Grafana/DataSource/Token field it immediately finds my bucket. How come I am not able to provision the same token?

docker-compose.yml

version: '3.3'
services:
  influxdb:
    image: influxdb:2.1-alpine
    env_file: configuration.env
    ports:
      - '8086:8086'
    volumes:
      - influxdb_data:/var/lib/influxdb2
      - ./scripts:/docker-entrypoint-initdb.d
  grafana:
    image: grafana/grafana:8.3.0
    env_file: configuration.env
    ports:
      - '3000:3000'
    volumes:
      - grafana_data:/var/lib/grafana
      - ./Grafana/provisioning:/etc/grafana/provisioning
volumes:
  grafana_data:
  influxdb_data:

Configuration.env

####################
# InfluxDB options
####################

INFLUXDB_HTTP_AUTH_ENABLED=true
DOCKER_INFLUXDB_INIT_MODE=setup
DOCKER_INFLUXDB_INIT_USERNAME=admin
DOCKER_INFLUXDB_INIT_PASSWORD=admin
DOCKER_INFLUXDB_INIT_ADMIN_TOKEN=myToken
DOCKER_INFLUXDB_INIT_ORG=myOrg
DOCKER_INFLUXDB_INIT_BUCKET=myBucket
V1_DB_NAME=DBv1
V1_RP_NAME=RPv1
V1_AUTH_USERNAME=admin
V1_AUTH_PASSWORD=admin

datasource.yaml

apiVersion: 1
datasources:
  - name: InfluxDBFlux
    type: influxdb
    access: proxy
    url: http://influxdb:8086
    jsonData:
      version: Flux
      organization: myOrg
      defaultBucket: myBucket
    secureJsonData:
      token: myToken
    version: 1
    editable: true

Have also tried adding http Authorization header with value> Token myToken

Any tip on where I have gone wrong?