App not clear which format vaccination certificate acceptable

[MikeMcC399]

Avoid duplicates

• [ ] Bug is not mentioned in the FAQ bug relates to FAQ article https://www.coronawarn.app/en/faq/#vac_cert_invalid
• [X] Bug affects both Android and iOS, for specific issues / questions that apply only to one operating system, please raise them in the respective repositories:
  • Android repository
  • iOS repository
• [X] Bug is not already reported in another issue

Technical details

• Device name: Google Pixel 3a emulator
• Android version: 11
• App version: 2.4.1-RC2

Describe the bug

The introduction to scanning certificates does not clearly describe that only EU compatible vaccination certificates can be successfully scanned. Instead users are scanning QR codes that they received after being vaccinated, before the new format was introduced, and they receive the app error 'This QR code is not a valid vaccination certificate. (VC_PREFIX_INVALID)'.

Steps to reproduce the issue

1. On Start Screen, tap "Certificates"
2. Read text on screen "Add Certificates"
3. Tap "CONTINUE"
4. Read tile "Add Digital Proof of Vaccination"

Expected behavior

The app should be clear about what type of digital proof of vaccination it can accept.

Possible Fix

Add text to the screens leading up to the QR-Code Scan so that the user is able to recognize if the QR-Code they plan to scan is likely to be accepted by the app. If the app is only able to scan in an "EU Digital Covid Vaccination Certificate", then this term should explicitly appear in the text.

Additional context

The document https://ec.europa.eu/health/sites/default/files/ehealth/docs/covid-certificate_paper_guidelines_en.pdf shows an EU example of a typical EU Digital Covid Vaccination Certificate in paper and digital form.

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Internal Tracking ID: EXPOSUREAPP-8029

[dsarkar]

@MikeMcC399 Thanks! Internally tracked.

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Internal Tracking ID: EXPOSUREAPP-8029 Corona-Warn-App Open Source Team

[MikeMcC399]

The certificate specification https://ec.europa.eu/health/sites/default/files/ehealth/docs/digital-green-certificates_v1_en.pdf describes in "4.2.2 QR 2D Barcode" that "..the base45 encoded data (as per this specification) SHALL be prefixed by the Context Identifier string "HC1:"."

To check if you are scanning a compatible code, use a regular QR reader to see if the QR code starts with "HC1:".

There is an example on https://github.com/Digitaler-Impfnachweis/certification-apis/blob/master/examples/README.md.

[MikeMcC399]

In CWA Android 2.5.0-RC3 (not yet released) I see the improved text.

Certificates > three-dot symbol > Information

"Add your EU digital COVID certificates in the app. This will enable you to prove your vaccination protection, a negative test result, or your recovery from an infection with the app."

"You can add EU digital COVID vaccination certificates, COVID test certificates, and COVID certificates of recovery in the app."

When 2.5.x is released, the texts above will solve the issue reported here. 👍🏻

[MikeMcC399]

This issue is resolved with the release of CWA 2.5.1, since the texts now clearly refer to EU digital COVID certificates.

Closing as resolved.

[dsarkar]

Thanks @MikeMcC399.