Welcome to the Roku Community, @mrmaso5i!
Thank you for reaching out about the issues you're having when pairing your Roku remote with your TCL Roku TV. I'd be happy to review this and find you the best resolution possible.
Before proceeding, what specific Roku remote is this? You can refer to this support article to help you Identify your remote.
Also, since this is a newly purchased TCL Roku TV, where did you purchase it? We'd like to know why it doesn't come with a remote. Furthermore, we highly suggest purchasing the remote directly from TCL as they manufacture their own player hardware, which includes their remote.
You may also use the Roku TV remote, which works well with your TCL Roku TV.
I'll be looking forward to your update.
Best regards,
Carly
Carly Y.
Roku Community Moderator