Why can't we use a comcast.net email address to sign up for your service????
Hi @9878eayrs,
Thank you for contacting TeamViewer Community.
Once a user created a TeamViewer account, the account activation link is sent to a email box. If you cannot find the email, please check spam box.
Please kindly verify your account and try to sign in TeamViewer.
For more details regarding TeamViewer account verification, please check the knowledge article - Validate your new TeamViewer Account.
Hope this would be helpful.
Best Regards,
Akiho