I'm at work, but have an A50 at home I can try later (unless my wife tries). We are getting a year free through Verizon, and have that phone for the kids already.
In the mean time, did you get to that Play store listing from a direct link? Usually when you search for an app and the phone isn't compatible, you simply don't get any results. It's also possible there's multiple versions of that app to help increase device coverage, and you're somehow viewing the wrong version. So if you haven't already, do a general search in Play for "Disney+" and see if it gives you any listings.
Something else to clarify is are you're in the U.S or other country that the app is supposed to serve? Apps can be region locked to restrict access only to certain countries. Also make sure you're not using a proxy server or VPN that could be tricking Play into thinking you're in another country.