I did a seven day trial for Fox nation thru Roku and I tried to login and it wouldn’t let me so I did a reset password and it never sent it to my email.
I ordered FN through Roku and use the same email address Roku has.
I’ve tried to reset the password multiple times and never get an reset email
If you subscribe to something through Roku you can generally only use the subscription on a Roku device and there's no need to log in since the subscription is tied to your Roku account. If you want to use a subscription on any device it's best to subscribe directly with the provider.
I signed upthrough Roku and that’s all I wanna watch it on but for some reason when I access it now it wants me to re-sign up. My free trial goes into September
Try accessing it through The Roku Channel.