If you’re still looking for solutions for flagging duplicate records I recommend checking out what we made at zzBots. Here is a link to our community forum that includes written and video instructions of how to install our " Airtable Flag Duplicate R...
I’m coming from zzBots and we created a plugin (pre-built bot) that flags duplicate records.
Here is a link to our community post that includes written and video instructions. I hope you find this helpful!