# TWINT plugin config fails at certificate upload

**URL:** <https://forum.shopware.com/t/twint-plugin-config-fails-at-certificate-upload/108469>\
**Category:** Shopware 6 (English)\
**Tags:** administration\
**Created:** [18. Januar 2026 um 15:20 UTC](https://forum.shopware.com/t/twint-plugin-config-fails-at-certificate-upload/108469 "2026-01-18T15:20:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![thorsten.niehues](https://avatars.discourse-cdn.com/v4/letter/t/ecccb3/32.png) [@thorsten.niehues](https://forum.shopware.com/u/thorsten.niehues)\
**Post date:** [18. Januar 2026 um 15:20 UTC](https://forum.shopware.com/t/twint-plugin-config-fails-at-certificate-upload/108469/1 "2026-01-18T15:20:17Z")

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I installed the TWINT Plugin

When I try to configure the SSL Connection, i can not upload the certificate.

The selected file „12356989-87fe-4ede-9c30-c7cbe85e4a86.p12“ has an unsupported format. Please use one of the following types: application/x-pkcs12.

I checked the validity of the file already via  
openssl pkcs12 -info -in 12356989-87fe-4ede-9c30-c7cbe85e4a86.p12 -noout

How can I upload the certificate under  
Settings → Extensions → TWINT credintials ?

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<div class="post-metadata">

**Author:** ![thorsten.niehues](https://avatars.discourse-cdn.com/v4/letter/t/ecccb3/32.png) [@thorsten.niehues](https://forum.shopware.com/u/thorsten.niehues)\
**Post date:** [18. Januar 2026 um 20:32 UTC](https://forum.shopware.com/t/twint-plugin-config-fails-at-certificate-upload/108469/2 "2026-01-18T20:32:45Z")

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It looks like a flaky JS  
Works on Safari under iOS

Does not Work on Chromium or Firefox under Ubuntu 24.04