Hi @Ledung75,
Thanks for your first post in the Roku Community!
We understand that you need assistance in adding the Apple Music channel on your Roku. We would be more than happy to assist you and resolve this issue.
Can you please verify what Roku model device are you using?
We also recommend checking if you recognize the Roku account email address directly from the Roku device by going to Settings > System > About. If both devices are linked to the same Roku account, the channels and purchases will be the same on each device. When a channel is added or removed on one device, the channel is automatically added or removed on all devices linked to that account that support the channel.
Please keep us posted and we'll continue assisting you from there.
Best regards,
Mary
Mary F.
Roku Community Moderator