I followed every download step, but now I can't find the card on my iPhone
If you were able to follow through every download step on your iPhone successfully, but can't locate the card in your contacts, there's a chance your phone does not save contacts directly on the phone. This is likely the case if you have a Microsoft Outlook or Exchange email account synced with your iPhone's Mail app.
The solution is to ensure your iPhone saves contacts to your phone, and not the Microsoft server. Here's how to do that:
Go to Settings > Contacts (you have to scroll down a bit to get to it) > Default account. If the default account is set to your Microsoft email, change it to a different email address, such as Gmail, Yahoo, or iCloud. Follow through with the card download steps again; you should be able to successfully locate the card.