Q:

Transfer iOS app from one Apple account to other

I want to transfer my iOS app from one apple store account to other. For both accounts I have team agent role and I have logged in with same access details.
At documentation, I found this article and I want to follow similar steps from my side - Transferring and Deleting Apps
But at above reference link, I found this option/link - Transfer App:

When I actually logged into my account, I can't able to find this kind of option to move app from one account to another. Here is screenshot for my account:

So actually where is the app transfer option?

A:

If you haven't published a version of the app yet, don't worry about transferring it, because you can't. 

Log into the team you want to transfer to.
Click on My Apps.
Click the + to create a new app, as you did in the other account.
Fill it in.
Forget about the old record - it's just metadata. If it bothers you, you can change almost everything about the unpublished record and use it for something else.

When To Transfer Apps
There's no point in transferring an empty app record. Simply create a new entry in the other iTunes Connect account. The whole point of an app transfer is to preserve reviews and the upgrade path for users. If those weren't a concern, you'd just create a new app entry anyway.
The only downside to this is that you lose the original app identifier (com.example.appname) but since nobody sees that, it doesn't really matter. Adjust your code signing certificates and you'll be fine.
When Transferring Apps Is Allowed
According to the documentation, there are a few conditions for transferring apps:

Both developer accounts must be completely set up.
The app must have a published version.
The app cannot use entitlements for iCloud or Passbook.
The app cannot use (or have ever used) In-App Purchase subscriptions
The app cannot be cannot be In Review.
Any in-app purchases for the app must also not be in review.
Any in-app purchases for the app must not have product IDs that are the same as in-app purchase products on the destination account.

What Transfers, What Doesn't
These things transfer over:

Bundle ID: The app's bundle identifier 
iTunes Connect App Record: Metadata (the description and the rest of the app store entry.) The new team name will appear under the app name once the transfer is complete.
User Upgrades: Users will see the next update from the new account. 

These things don't transfer over: 

Download Stats: App download number don't transfer over. The new developer account will start from zero downloads.
Keychain Access: Keychain access is lost for transferred apps, because the team prefix changes.
Handoff, Universal Links, Shared Web Credentials: If you're using an apple-app-site-association file, you'll need to modify it to include the old app identifier as well as the new one. You want both, because you don't want to break functionality for users who didn't upgrade yet.

