Like Sharkys pointed out alr.
Additional I wanted to comment on this:
No, you should choose ‘add new Homey’ (yes that’s a bit odd, but the way to go)
That is from ages ago, all can be done using the app, and that question isn’t asked any longer… what app version do you use?
Did you ever update it?
The v6.x app isn’t available in the official app stores anymore, but for Android it still can be downloaded from apkpure.com or apkmirror.com and the likes.
Or consider installing the new v7.x app, but it has some serious speed issues especially with the flow editor, favorite devices editing and the devices tab when you use ‘expanded’ instead of ‘collapsed’ view.