You do not need TWRP for the app, TWRP is for the zip file. They both do the same thing but most people familiar with TWRP use that method.
I found 3 versions for the S6
S6 Edge: https://twrp.me/samsung/samsunggalaxys6edge.html
S6 Edge +: https://twrp.me/samsung/samsunggalaxys6edgeplus.html
Hello, it looks like your phone is indeed a rare version however I found some sites that might give you some options to root if using the Magisk app fails. But I also found some topics here on XDA where the S6 Active is impossible to root so I doubt it will work.
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