When you unpair decide how do you get it back paired
When you unpair your phone from air drop off Roku tv how do you pair it back
iPhone 12 Pro, iOS 14
Airdrop? perhaps Airplay....
Launch Airplay on your TV. Many TVs ask you to input a code (just the first time you connect it, or always).
Then Launch Airplay on your iPhone via Control Center.
Regards
Giulio