If you bought one online after market it is a chance an nfc module was not installed. Seen this a lot. You would have to desolder your original and place on new

It’s easy. I use my warming burner on my stove set at 2. Trim the glass around the lcd to remove the curved portions still in tact. You can snip with nail clippers and I put 2 strips of kapton tape on my burner to regulate the heat . Start my wire and tape the screen down to the kapton tape as I work the wire through like its butter. No damage to polarizer

Its polarizer film. And for the apple watch it is very dark in contrast. Done plenty using the warming burner on my stove with laptop tape. Perfect removal everytime. I would suggest using Samsung's polarizer sheet as a replacement. Trim to fit and use loca glue to attach and loca for