It’s worth quickly checking your email’s spam folder in case it was accidentally put in there.
If you are not 100% sure you have ever had Argent wallet, please go back to the title screen of the app and make sure you are using Create a new wallet and not I already have a wallet button on the main page.
Please note that if you have Argent X wallet, it is not related to your Argent mobile wallet, and you can't recover it in the app, so I already have a wallet option will not work.
Otherwise please email support@argent.xyz and we’ll fix it.