Error : error authorizing query: create admin user first or disable authentication

Dear community,
I am a but new using grafana 6.4.4 and I try to make it work with influxdb version 1.7.9, but I am always having this error :
Error : error authorizing query: create admin user first or disable authentication

I attached the capture of the config I use

Note : this instance and also the influxdb are both running in AWS in docker.

I have try to change many parameter but I never succeed to make it work. Here are my config file (without the password or the IP address)
grafana.env
GF_SECURITY_ADMIN_USER=admin
GF_SECURITY_ADMIN_PASSWORD=MyGrafanaPassword
GF_PATHS_PROVISIONING=/var/lib/grafana/provisioning
INFLUXDB_URL=http://MY_IP_AWS:8086
INFLUXDB_ADMIN_USER=admin
INFLUXDB_ADMIN_PASSWORD=MyInfluxDBPassword

influxdb.env
INFLUXDB_HTTP_AUTH_ENABLED=true
INFLUXDB_ADMIN_USER=admin
INFLUXDB_ADMIN_PASSWORD=MyInfluxDBPassword

I have also try to change the /etc/influxdb/influxdb.conf file following that post :

But without success.

Does anyone have some idea on how to solved this error and make it work ?

Thanks in advance for your help.
Feel free to ask if something is missing or not clear in this post :innocent: