Please note that you'll be able to use this feature only if your company has access to Visa real-time feed. Here are the steps to get access.
First, navigate to settings.
In the Profile section -> Corporate Cards, you may see a list of cards. Please check the last 4 digits of your card carefully. If you find the card that you have, then click on the "More actions" and you'll see an option to "Connect to Visa Real-time Feed". Go ahead and click that and complete the steps.
If you don't find your card in the list, then click on "Add another Corporate Card" and complete the steps.
In some cases, you may be required to verify that you are the cardholder. To do this, you'll need to come back AFTER you've performed a transaction e.g. bought a coffee. Sometime after the transaction is performed, if you come back to the same page, you'll see an option to "Verify Card".
To verify your card, you'll need to choose the last transaction you incurred after you connected your card.
After this, your card is now connected to the Visa Real-time Feed. To receive a text message for your card expenses, do register and verify your mobile number using steps outlined here.