Converting UNIX timestamp to datetime

I have a UNIX timestamp being returned as 1635854750 which when putting into an online converter should be Tue Nov 09 2021 11:06:11 GMT+0000.

So i have created a custom column with the following query to convert.

#datetime(1970,1,1,0,0,0) + #duration(0,0,0,[data.resolved_time]/1000)

But this isn't yielding the result i'm expecting (row 1)?

Am i missing something?