OK, I've done some testing, and I can login to my SAFE portal from both my main PC, and my (Android) phone. I can then send an email link from one device to another by clicking the Install button in the SAFE portal. So, I don't think this is a problem with the website itself (tested on https://mysafe.f-secure.com/login).
I note that you say you created your SAFE account via your iPad - I'm wondering if that isn't the full F-Secure SAFE package, as only the SAFE Browser is available for iOS devices?
Can log in on desktop and on a laptop, but on our thirs computer, also a laptop we cannot login with the correct name and password. This seems to be a problem with your software that you have a hard time fixing. The issue is when you create your login name and password on one computer you cannot recognize it one a defferent computer.
On devices... where you not able to login... can not be something from next points:
-> Browser with some of plugins (something as NoScript)?
I have normal experience about login with some of devices (five/seven devices with same/different platforms - Linux and some of Windows versions; and some of mobile platforms - Windows Phone and Android).
Can to reproduce troubles around login-process (with normal passwords/login) as can be related with description from current topic (and related another topic):
-> with outdated version of IceWeasel under outdated Linux-platform; But there will be "mistake"-prompt under page, which will be visible.. as "something wrong".
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