Roles Add user to role after become OG group member

I am trying to use Rules to automatically add a user to a role when that user becomes a member of an OG group.
This seems to be very easy:

Event:
User has become a group member

Condition:
none

Action
Add user role
Parameter: User: [account], Roles: Member

It just does not work, user does not get added to the role.

However, if I debug the [account] value in the same rule after "add user role", I can see the role is added:

roles (Array, 2 elements)
2 (String, 18 characters ) authenticated user
5 (String, 6 characters ) Member

But it is not saved. If I look under "people" afterwards, the role member is not assigned to the user that gets approved to be a OG member.

If I change [account] to [site:current_user], the current user gets added to the role, and that works fine. So something goes wrong with [account], it does not gets saved.

This is the export of my rule:

{ "add_to_role" : {
    "LABEL" : "Add User to role after OG",
    "PLUGIN" : "reaction rule",
    "REQUIRES" : [ "rules", "devel", "og" ],
    "ON" : [ "og_user_insert" ],
    "IF" : [ { "data_is" : { "data" : [ "og-membership:state" ], "value" : "1" } } ],
    "DO" : [
      { "user_add_role" : { "account" : [ "account" ], "roles" : { "value" : { "5" : "5" } } } },
      { "devel_debug" : { "value" : [ "account" ] } }
    ]
  }
}