I was told I can run my Roku from hotspot but it keeps saying it can't email me.

Hi John86,

Thank you for your first post here in the Roku Community!

We understand you are having a problem activating your Roku device. No worries; help is here. Confirm that you entered your email address correctly. Email addresses are not case-sensitive, but extra characters that may have been added by mistake can prevent an activation email from arriving in your inbox.

We hope this helps. Please keep us posted if there's anything else we can do to assist you.

Best regards,
John