Hi
I have the same issue that is submitted at this link:
I logged out four times but I cannot yet add my device which is working OK with Tinker.
I am clicking on " Refresh device" but nothing happens.
If I click on ADD Device, it asks me for introduce my device ID and after that it tell me that the device has owner yet, who is myself !!!!!!!! 
The common suspicion in such a case is that you have got two accounts with slightly different data.
You may need to PM @rickkas7 your device ID so he can look up which account it’s claimed to and assist you with transfering it to yourself.
BTW, if you have a working Particle mobile app and physical access to the device, you should be able to “force claim” a Photon that way too - at least this used to work.
Hi ScruffR
Thanks for your answer.
Please let me know the process to “Force claim” and from “where” I should do that process.
As said
The Particle mobile apps available via Google Play Store or the Apple App Store shoule be able to do that.
Hi guys, sorry for bringing up this old thread again but I'm experiencing the very same “Device with this id is already present” issue on the web ide trying to setup my new tachyon. Android app seems me not to be a thing anymore so I can’t force pair the device. Is there a fix for it?
Thank you
You cannot program the Tachyon using the Web IDE.
The device was added to your account when you set the Tachyon up, but since you can't program it from the Web IDE, it does not show up. Since it's already in your account, you can't add it again.