Probably best to email support on hello@freetrade.io and theyāll be able to provide more advice on resolving the issue.
To help with a quicker resolution from support, youāll want to confirm your phone (e.g. iPhone X, Samsung S10 etc) and OS version if you know/can find that.
That they specifically list iOS 11.2+ having issues with the magic link, if youāve got an iPhone with this iOS version or higher it might answer your question.