iPhone 11, ios15.1

Thanks for getting back with us, michalis2142. We apologize for not understanding your question the first time and thanks for the clarification. As explained in the support article linked above: "Your vaccination card can't be shared with other iPhone, iPod touch, or Apple Watch users." So, you are able to have only one COVID vaccine card per device.

We hope that helps to answer your question. Have a great rest of your day!

Hello michalis2142,

Thanks for reaching out to Apple Support Communities. Upon review of your post, it seems that you need some help adding a COVID-19 vaccination card to your Apple Wallet. We can see why you’d want this taken care of, so let us help from here! Let’s start by reviewing the following article which may help: Add verifiable COVID-19 vaccination information to Apple Wallet and Health. This article explains how to: “Add verifiable COVID-19 vaccination information as a vaccination card in Wallet and download and store verifiable vaccination and test result records in the Health app.”

Please let us know if you have follow up questions, so we can continue assisting. Take care!

You are quite welcome. Have a lovely day and thanks for reaching out, michalis2142.