# Not able to receive the Device Authentication Token via Device API. signature verification failed

**URL:** <https://hub.mender.io/t/not-able-to-receive-the-device-authentication-token-via-device-api-signature-verification-failed/7705>\
**Category:** General Discussions\
**Tags:** api, deviceauth, token\
**Created:** [April 9, 2025, 7:03am UTC](https://hub.mender.io/t/not-able-to-receive-the-device-authentication-token-via-device-api-signature-verification-failed/7705 "2025-04-09T07:03:22Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![grasshopper](https://avatars.discourse-cdn.com/v4/letter/g/f19dbf/32.png) [@grasshopper](https://hub.mender.io/u/grasshopper)\
**Post date:** [April 10, 2025, 6:42am UTC](https://hub.mender.io/t/not-able-to-receive-the-device-authentication-token-via-device-api-signature-verification-failed/7705/3 "2025-04-10T06:42:52Z")

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Hi @peter, thanks for your quick reply.

The REQUEST\_BODY I posted may have given a wrong impression. I mainly posted it regarding content. As I said, to avoid formatting issues I followed the tutorial I linked, and used the same shell commands.

[How to write a custom client interfacing a Mender server](https://hub.mender.io/t/how-to-write-a-custom-client-interfacing-a-mender-server/1353)

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/mender/original/2X/c/cdc05bc0c8a772e4ca8857fd2d061dc43293d921.png)

There, shell variables are (re)-used for the process. I am in particular wondering what may be the issue if I am following the tutorial exactly. The process is still up to date, right?

Thanks for the fake mender client link, I will check it out. And thanks for your help.

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