# Register end device failed / End device already registered

**URL:** <https://www.thethingsnetwork.org/forum/t/register-end-device-failed-end-device-already-registered/66174>\
**Category:** Uncategorized\
**Tags:** end-devices\
**Created:** [January 3, 2024, 8:57am UTC](https://www.thethingsnetwork.org/forum/t/register-end-device-failed-end-device-already-registered/66174 "2024-01-03T08:57:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![entwicklungdiggeraet](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/entwicklungdiggeraet/32/35697_2.png) [@entwicklungdiggeraet](https://www.thethingsnetwork.org/forum/u/entwicklungdiggeraet)\
**Post date:** [January 3, 2024, 8:57am UTC](https://www.thethingsnetwork.org/forum/t/register-end-device-failed-end-device-already-registered/66174/1 "2024-01-03T08:57:44Z")

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Dear all

I get following error.

 ![Untitled](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/b/9/b9f8d1e13c2bcb7bd32cfe9bb4e7a2252f765262.png)

#### Submit failed

An end device with JoinEUI `0000000000000000` and DevEUI `0004A30B00E9XXXX` is already registered as `arc1-1022-eui-0004a30b00e98fbe` in application `prod-arc-1-2021`

I am pretty sure that I created the application “prod-arc-1-2021” myself, but I can no longer find it. I assume it still exists on the TTN Platform V2 which I no longer have access to. How can I delete the application or have it deleted so that I can use the devices again? Its urgent!

Best regards  
Pascal

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**Author:** ![descartes](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/descartes/32/47220_2.png) [@descartes](https://www.thethingsnetwork.org/forum/u/descartes)\
**Post date:** [February 10, 2024, 6:25pm UTC](https://www.thethingsnetwork.org/forum/t/register-end-device-failed-end-device-already-registered/66174/2 "2024-02-10T18:25:35Z")

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A post was merged into an existing topic: [Axios Error while trying to view device details on TTN web console](https://www.thethingsnetwork.org/t/axios-error-while-trying-to-view-device-details-on-ttn-web-console/66723/3)

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**Author:** ![seamussmith](https://www.thethingsnetwork.org/forum/letter_avatar_proxy/v4/letter/s/a183cd/32.png) [@seamussmith](https://www.thethingsnetwork.org/forum/u/seamussmith)\
**Post date:** [March 6, 2024, 2:00pm UTC](https://www.thethingsnetwork.org/forum/t/register-end-device-failed-end-device-already-registered/66174/3 "2024-03-06T14:00:03Z")

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I am having the same issue, although I’m using a device that was previously used by someone else. Any advice on the matter would be incredible.