Point of Task.Run if it will be awaited immediately

Question

I have this method:

public async Task DoSomething()
{
    string token = string.Empty;

    await Task.Run(() =>
    {
        using (var sc = _dbManager.CreateSession())
        {
            // somework...
        }
    });

    using (var resp = await client.PostAsync(authenticationEndpoint,
        new FormUrlEncodedContent(authenticateRequest), stoppingToken))
    {
        resp.EnsureSuccessStatusCode();
        string stringResponse = await resp.Content.ReadAsStringAsync(stoppingToken);
        var response = JsonConvert.DeserializeObject<Response>(stringResponse);
        token = response.AccessToken;
    }
}

Now I do not understand why I need to use await Task.Run? It's confusing for me to understand logic behind this, as I'm awaiting the task to finish anyway, so why should I put it in the Task in the first place?

My lead told me that this was the way to go, and also explained to me that if I don't put that in Task, the code will be executed again from the top, after await client.PostAsync.