authentication - AWS Cognito : Unable to construct an endpoint for cognito-identity in region None -

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i use aws cognito cli command syntactically exact 

aws cognito-identity get-open-id-token-for-developer-identity --identity-pool-id eu-west-1:c1b83398-09xx-4x38-b10x-2346x1xdc1b --logins login.mywebsite.myappname=johndoe@example.com

said command has returned tokens previously.

i receiving error "unable construct endpoint cognito-identity in region none"

i have retired various cognito identity pools; swapping identity-pool-id , logins appropriate. ideas?

ps : if use cli command describe-identity-pool

e.g. aws cognito-identity describe-identity-pool --identity-pool-id eu-west-1:c1b83398-09xx-4x38-b10x-2346x1xdc1

i receive same error message.

x-posted on aws cognito forum

seems region missing aws configuration. can please run 'aws configure' , provide region 'eu-west-1' identity pool belongs region.


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