I setup a new language - English(UK) by add a same lambda in eu-west-1, set geo location lambda in skill and copy almost all other setting from English(US).
But i found i couldn't make alexa to call the eu-west-1 lambda rather than us-east-1 one. (Note that i am in China)
I've tried to:
Set language to English(UK) in Echo Show and ask Echo Show to discover devices.
Ask my friend in UK to discover devices on Alexa app.
All the requests were routed to us-east-1.
I wonder how alexa choose lambda?