A:Answer Below is a link to the xfinity site and it looks like this particular TV supports the Xfinity Stream Beta app. Below you will find a list of other Samsung TV's that support the app. I hope this helps.
https://www.xfinity.com/support/articles/activating-xfinity-stream-samsung
The Xfinity Stream Beta app is available on the following Samsung device models:
2018 TVs with minimum software version T-KTM2AKUC 1131.9 and Model Codes NU8500, NU850, NU8000, NU800, Q9F, Q8F, Q7C, Q7F and Q6 [F = Flat, C= Curved]
2018 TVs with minimum software version T-KTM2LAKUC 1131.9 and Model Codes NU7300, NU730, NU7200, NU7100 and NU710
2018 TVs with minimum software version T-KTSUAKUC and Model Code UNXXNU7090
2018 TVs with minimum software version T-KTSNAKUC 1131.9 and Model Codes N5510, N5500, N5350, N5300, N4500, N4350 and N4310
2017 TVs with minimum software version T-KTMAKUC-1210.8 and Model Codes Q9F, Q8C, Q7F (Flat), Q7C (Curved), MU9000, MU8500, MU8000, MU7600, MU7500, MU750, MU7100, MU700, MU7000, MU6500, MU6490, MU6300, MU630 and MU6290
2017 TVs with minimum software version T-KTSAKUC-1210.8 and Model Codes M5300, M530, M4500 and M450