X1 box HDMI arc compatible?

I received a Vizio soundbar recently. I am trying to set it up with my TV and my X1 box/dvr. I haven't had any sucess in getting it set up the way I thought it would be best. The TV is an older Insignia https://www.insigniaproducts.com/pdp/NS-32L550A11/9588387 The soundbar is a Vizio https://support.vizio.com/s/article/SB3651-E6-Model-Information-EXT?language=en_US Even after reading the manuals and now searching the forums here, I am not much better off. No matter what combonation or direction(s) I string HDMI cables, I am not able to get things set up. I wasn't sure if the TV and/or some of the cables were actually "ARC" compatible. Since the soundbar is equipped with Smart cast and apps, I have been hoping to get it set up correctly in order to use it as more than just a speaker for the X1 box which is all I have been able to do so far using the old fashioned RCA cables for component inputs into the bar. Searching the forums I see a lot of issues with using ARC and the X1, some older and some recent. Is this something I can do? Do I need a newer different X1 box? Do I need a newer TV with different connections? I think I have tried about every possible connection so far, HDMIs in many conigurations, the digital optical cable, and as last resort the RCA component cables. Wondering if anyone more experienced (smarter) than myself would have any help or advice? THANKS very much in advance ! ! !