How to setup up grafana for high availability using mysql as backend and store sessions?

Hi ,
I am trying to configure grafana 7.0.1 for HA using the tutorial at https://grafana.com/docs/grafana/latest/administration/set-up-for-high-availability/#set-up-grafana-for-high-availability.The setup is using 2 linux instances running grafana and both use mysql as the backend.
A stateless load balancer can route requests to either server .I saw a few issues
1)I couldn’t save permissions for the users using the land balanced url .I could if I directly used the url with the hostname directly .Could this be due to session not being setup?
2)The docs states that after 6.2 I don’t need to setup session to be stored in mysql?
I tried setting up the provider using https://blog.zufardhiyaulhaq.com/setup-grafana-for-high-availability/
but don’t see anything in logs so not sure if its working
3)I installed grafana 7.3.3 but don’t see the session section at all in the default.ini.
Example
[session]
provider = mysql
provider_config = grafana_user:UnholyConfessions@tcp(10.201.201.40:3306)/grafana_user
Was it removed?