# Unable to set User PIN to full 127-character limit

**URL:** https://support.nitrokey.com/t/unable-to-set-user-pin-to-full-127-character-limit/7312
**Category:** FIDO2 / Nitrokey 3
**Created:** [October 30, 2025, 4:57am UTC](https://support.nitrokey.com/t/unable-to-set-user-pin-to-full-127-character-limit/7312 "2025-10-30T04:57:56Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![engr](https://support.nitrokey.com/letter_avatar_proxy/v4/letter/e/48db29/32.png) [@engr](https://support.nitrokey.com/u/engr)
#### Post date: [October 30, 2025, 4:57am UTC](https://support.nitrokey.com/t/unable-to-set-user-pin-to-full-127-character-limit/7312/1 "2025-10-30T04:57:56Z")

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Hello!

I’m using a Nitrokey 3A (firmware versions: 1.8.1 and 1.8.3) on **Ubuntu 22.04 LTS**. The documentation mentions that the User PIN can be up to **127 characters long** , but when I try to set a PIN longer than around **80-90 characters** , I get an error that the PIN is too long.

I’ve tried both the default **GnuPG (2.2.27)** and the latest **GnuPG (2.4.0** and **2.4.8)**, but the result is the same.  
Has anyone successfully set a 127-character PIN?

I’ve also tried on an open source application on windows10 pro and ubuntu 24, but did not get the required results.  
Is this a limitation from GnuPG, libccid, or something specific to the Nitrokey firmware?