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[Multilingual Chatbot] Invalid region us-east-1 on RecognizeText Lex
Question
multilingual-chatbot
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Forge asset by OutSystems
Service Studio Version
11.55.21 (Build 64159)

After debugging chatbot and setting site properties as per V2 lex bot created in Aws it shows 

Invalid region us-east-1 

stack trace on service center error logs

at ssCloneOfAmazonLex_IS.RssExtensionAmazonLex_ext.MssAWSLex_RecognizeText(HeContext heContext, IRecord inParamAuthenticationInfo, String inParamRequest, String& outParamResponse)
   at ssCloneOfAmazonLex_IS.Actions.ActionRecognizeText(HeContext heContext, STAWSCredentialsStructure inParamAWSCredentials, STRequest_RecognizeTextStructure inParamRequest, STResponse_RecognizeTextStructure& outParamResponse)
   at ssMultilingualChatbot.RsseSpaceCloneOfAmazonLex_IS.MssRecognizeText(HeContext heContext, IRecord inParamAWSCredentials, IRecord inParamRequest, IRecord& outParamResponse)
   at ssMultilingualChatbot.Actions.ActionRecognizeText(HeContext heContext, STAWSCredentialsStructure inParamAWSCredentials, STRequest_RecognizeTextStructure inParamRequest, STResponse_RecognizeTextStructure& outParamResponse)
   at ssMultilingualChatbot.Actions.ActionAWSInteraction(HeContext heContext, String inParamMessage, String inParamUserId, Boolean& outParamIsFulfilled, Boolean& outParamSuccess, String& outParamFulfill_ErrorMessage, String& outParamBotMessage) 

MultilingualChatbot.oml
2025-12-09 14-11-18
Janakiraman JR
Solution

Hi Saish,

To resolve this issue, you need to update the region format in your OutSystems application to match the AWS SDK's expected format.OutSystems

For the "US East (N. Virginia)" region, the correct format is USEast1 (note the case and absence of dashes).

https://docs.aws.amazon.com/en_gb/general/latest/gr/lex.html

By updating the region format to match AWS's expected format, your application should be able to connect to the Amazon Lex service without encountering the "Invalid region" error.

UserImage.jpg
Saish Bhende

Hi @JR. thanks a lot this fixed the issue. I ran the debugger again and it mentions 


The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.
   at ssCloneOfAmazonLex_IS.RssExtensionAmazonLex_ext.MssAWSLex_RecognizeText(HeContext heContext, IRecord inParamAuthenticationInfo, String inParamRequest, String& outParamResponse)
   at ssCloneOfAmazonLex_IS.Actions.ActionRecognizeText(HeContext heContext, STAWSCredentialsStructure inParamAWSCredentials, STRequest_RecognizeTextStructure inParamRequest, STResponse_RecognizeTextStructure& outParamResponse)
   at ssMultilingualChatbot.RsseSpaceCloneOfAmazonLex_IS.MssRecognizeText(HeContext heContext, IRecord inParamAWSCredentials, IRecord inParamRequest, IRecord& outParamResponse)
   at ssMultilingualChatbot.Actions.ActionRecognizeText(HeContext heContext, STAWSCredentialsStructure inParamAWSCredentials, STRequest_RecognizeTextStructure inParamRequest, STResponse_RecognizeTextStructure& outParamResponse)
   at ssMultilingualChatbot.Actions.ActionAWSInteraction(HeContext heContext, String inParamMessage, String inParamUserId, Boolean& outParamIsFulfilled, Boolean& outParamSuccess, String& outParamFulfill_ErrorMessage, String& outParamBotMessage)

[2] The remote server returned an error: (403) Forbidden.
   at Amazon.Runtime.Internal.HttpRequest.GetResponse()
   at Amazon.Runtime.Internal.HttpHandler`1.InvokeSync(IExecutionContext executionContext)
   at Amazon.Runtime.Internal.Unmarshaller.InvokeSync(IExecutionContext executionContext)
   at Amazon.Runtime.Internal.ErrorHandler.InvokeSync(IExecutionContext executionContext)

[3] The remote server returned an error: (403) Forbidden.
   at System.Net.HttpWebRequest.GetResponse()
   at Amazon.Runtime.Internal.HttpRequest.GetResponse() 


I have double checked that the Access_key and secret key and matches the one which is configured in the site properties would there be any specific issue?

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