Inspire HR will not connect to Samsung Phone

[SusieBarn]

I have downloaded the Fitbit app on my android phone and when I try to connect my Inspire HR I get to the point where the app says enter the 4 digits on the Inspire display. Having done this it says "wait we are on it, it is taking longer than we expected" but it never gets beyond this point. The Inspire does not connect. Fitbit sent me a new unit, but this did not help matters. What am I doing wrong?

[Odyssey13]

Which phone do you have and is it on the list of compatible devices? click to see

[SusieBarn]

I have a Galaxy J3 which is listed as being compatible, but my software revision is 5.1.1 which seems not to be compatible!

[Odyssey13]

here is something a moderator posted about phones being compatible:

"Please note that your phone or tablet is not on our list of compatible devices. We confirmed that the devices on this list are fully compatible with all features of Fitbit devices and the Fitbit app. While a phone or tablet may not be verified as fully compatible, the Fitbit app may still work with your device. 

We routinely test new devices to ensure full compatibility with Fitbit devices and the Fitbit app, and are constantly working to confirm compatibility with new phone models. Be sure to verify that your phone or tablet meets the minimum operating system requirements.

If your phone supports Bluetooth 4.0, we provide assistance and troubleshooting steps. Because your phone or tablet is not fully compatible with Fitbit devices, we can't guarantee syncing and other Fitbit features. "