Always ensure that you create your account using the app - not website. 

Can't see the Verify Link?

Often, your browser or email client can block the Verify Link on your email. To view it, please check your security settings of the email client/browser you are using. If you are using a client such as outlook, you'll usually be presented with an option to "view email in a browser"- please click it to do so. You'll be able to see the email then. 

The App won't let me sign in e.g. I get a message such as "Max Auth Attempts".

This means that you have likely tried to sign incorrectly too many times. You will be blocked from 5 minutes to 24 hours depending on how many times you have tried to access the account incorrectly. To speed up the process, you can try and use a different internet connection to login e.g. wifi to mobile data.