I'm sure I've seen this somewhere here but I can't find it - I don't seem to be able to save Echo/Dot wifi passwords to Amazon. I've ticked the box during setup but there's nothing registered on the Amazon/Alexa site which explains why I've had to keep entering it while I've been changing my router/wifi configurations. Others have mentioned saving the password as though it works for them and I'm wondering if it's a UK issue or a very local one to me.