I have the sign in feature on my app, every of my testers can easily login, expect two of them who have @icloud.com email address.
Seems like iCloud is blocking the reception of the PIN code email from glide.
The PIN code email neither appear in their spam folder. I tested myself with an @icloud.com email. It definitely doesn’t work.
You can try it yourself is you want: https://ridden.glideapp.io/
Any advice on how to setup the sign in option to resolve this problem?