Solution: TVAPP-00101 on smart tv when have 2 accounts

Error: TVAPP-00101 on smart tv or issue on Roku when you have 2 accounts for same address.

Make sure both of your accounts at your address are linked.
If not, use this link to help link your accounts: https://www.xfinity.com/support/articles/switching-between-multiple-accounts.
Then, follow the steps below.

Open Xfinity app
Go to account
Click account settings
Click on Xfinity ID and security
Manage your linked accounts
Log in
Make your new or newest account as default
Sign out of Xfinity steam on smart tv or Roku
Sign back in on Xfinity stream
Use the website Xfinity.com/authorize to sign in with the code provided on the sign in screen