Unable to get folder by id when using Boxr JWT get_user_token- Box API - ruby

Question

I'm unable to a folder by providing an id to that folder using Boxr gem. Previously I didn't has the enterprise settings as shown in this post which I have now fixed. I'm creating a token using JWT authentication get_user_token method the following way.
token = Boxr::get_user_token("38521XXXX", private_key: ENV.fetch('JWT_PRIVATE_KEY'), private_key_password: ENV.fetch('JWT_PRIVATE_KEY_PASSWORD'), public_key_id: ENV.fetch('JWT_PUBLIC_KEY_ID'), client_id: ENV.fetch('BOX_CLIENT_ID'), client_secret: ENV.fetch('BOX_CLIENT_SECRET'))
I then pass this this token when creating a client.
client = Boxr::Client.new(token)
when I check the current user on client this is what I get:
client.current_user
=> {"type"=>"user",
"id"=>"60853XXXX",
"name"=>"OnlineAppsPoC",
"login"=>"AutomationUser_629741_06JgxiPtPj#boxdevedition.com",
"created_at"=>"2018-10-04T08:41:32-07:00",
"modified_at"=>"2018-10-04T08:41:50-07:00",
"language"=>"en",
"timezone"=>"America/Los_Angeles",
"space_amount"=>10737418240,
"space_used"=>0,
"max_upload_size"=>2147483648,
"status"=>"active",
"job_title"=>"",
"phone"=>"",
"address"=>"",
"avatar_url"=>"https://app.box.com/api/avatar/large/6085300897"}
When I run client.methods I see there is folder_from_id however when I call that method I get the following error:
pry(#<FormsController>)> client.folder_from_id("123456", fields: [])
Boxr::BoxrError: 404: Not Found
from /usr/local/bundle/gems/boxr-1.4.0/lib/boxr/client.rb:239:in `check_response_status'
I have the following settings:
I also authorize the application. Not sure what else to do.

Answer 1

token = Boxr::get_user_token(user_id,
private_key: ENV.fetch('JWT_PRIVATE_KEY'),
private_key_password: ENV.fetch('JWT_PRIVATE_KEY_PASSWORD'),
public_key_id: ENV.fetch('JWT_PUBLIC_KEY_ID'),
client_id: ENV.fetch('BOX_CLIENT_ID'),
client_secret: ENV.fetch('BOX_CLIENT_SECRET'))
client = Boxr::Client.new(token.access_token)
folder = client.folder_from_id(folder_id)
client.upload_file(file_path, folder)

Answer 2

For anybody using C# and BOXJWT.
You just need to have a boxManager set up and will get you with anything you need, say BoxFile, Folder etc.
If you have the folderID, well & good, but if you need to retrieve, this can be done as shown below:
string inputFolderId = _boxManager.GetFolder(RootFolderID).Folders.Where(i => i.Name == boxFolder).FirstOrDefault().Id; //Retrieves FolderId
Folder inputFolder = _boxManager.GetFolder(inputFolderId);