Hello! I see you're encountering the error message in the POSTIDENT app: "Transaction number expired. Contact your contractual partner." Let's clarify a few things first so I can provide the best guidance.

When you mention "contractual partner," it usually refers to the company or organization that requested you to verify your identity via POSTIDENT. This might be your bank, telecom provider, or any service that uses POSTIDENT for identity confirmation.

To help resolve this, could you tell me:

1. Which company or organization initiated the POSTIDENT identification process for you?
2. How long ago did you receive the transaction number or start the process?
3. Have you attempted to restart the identification process within the app?

Typically, a transaction number expires after a certain period—often for security reasons. If it has expired, you would need a new transaction number from the company requesting your identity verification.

In general, the steps to solve this issue are:

1. Reach out to the company or service that asked you to complete the POSTIDENT verification and inform them about the expired transaction number.
2. Request a new transaction number or identification request from them.
3. Once you receive the new transaction number, use it promptly in the POSTIDENT app to complete your verification.

If you are unsure who the contractual partner is or how to contact them, please let me know, and I'll guide you on next steps to identify the proper contact.

Are you ready to try reaching out to the company that requested your ID verification? Or is there any other detail you'd like me to help with right now?

Deutsche Post, for digital proof of life

Thank you for that info! Since you're using the POSTIDENT app from Deutsche Post for your digital proof of life (digitale Lebensbescheinigung), the "Transaction number expired" message means the identification session tied to the transaction or verification number you received has timed out.

Here’s what you can do step-by-step:

1. Get a new transaction number (Vorgangsnummer):
The transaction number used in the POSTIDENT app for your proof of life has a validity period. Once it expires, you need a fresh one.

2. Contact the Deutsche Rentenversicherung or the entity that sent you the digital life certificate request:
They generate and provide the QR code and transaction number for the POSTIDENT verification. You can find more about this process here on Deutsche Post’s site about the digital proof of life:
DLN - Fragen & Antworten - Deutsche Post

3. Start the POSTIDENT process again with the new transaction number/QR code:
Scan the new QR code using the POSTIDENT app on your WebKit Android 12 device to begin a fresh session. Follow the on-screen instructions to complete your proof of life.

If you do not know where to get the new number or QR code, I recommend contacting the Deutsche Rentenversicherung customer service or checking any communications (letters or emails) they sent you, as they usually provide a link or instructions to generate a new proof of life request.

If you want, I can help you locate their contact details or guide you through the app process once you have the new transaction number.

Does this sound manageable? Would you like help with how to reach Deutsche Rentenversicherung or with app steps after getting your new transaction number?