I just did here, right now and worked fine..
I do agree the way ITEAD does is bad, but at least it works. (for me).
I don't know if this is based on region as they use AWS but in Europe is working.
Now I have a problem with one smart socket that does not connect to my router, I have reset it 5 times and still, seems to be a defect.
I had the exact same problem, both phone have eWeLink v3.5.3 on android.
I tried to type manualy all the e-mail address and to have ny wife's phone conneted on the eWeLink app at the same time ==> It worked !
I discovered that the "Sharing Timeout" issue was only occurring when the master device was an Android. Apple's IOS typically works sharing.