Have you changed the Wifi SSID away from the one that came supplied as default?
Yes, I have changed that to make it easier to tell them apart.
But that should not make Android unable to connect but still allow my iPad to connect, right?
I thought this too and I was very wrong.
After changing my hotspot to my reg, oldest Android and all iOS connected, but newer Android refused point blank.
In desperation I changed the SSID back to the supplied SSID, and my (newer) Android phone connected again.
I often say I would rather be happy than right, and on this occasion I was granted my wish.
Egg on face but Rosetta FX working. No point having it the other way round...
Feel free to prove me wrong, it will take minutes and is easier than arguing.