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Invalid Session ID error after installing my AppExchange



I built an AppExchange linked to an external service to search address and update my account data.

Every time I call my external service, I send to him sessionId and Salesforce bases URl (NA14, EU1...). Thus, we do not need to login to salesforce with a technical user.

In my DEv Org which hosts my AppExchange, it works fine. I created my beta package and uploaded it.

I installed it in another dev Org, then I get Invalid sessionId error. detail message below, in that org.

Invalid Session ID found in SessionHeader: Illegal Session. Session not found, missing session key


I checked remote site setting. It is well set up.


I have two questions :

- Can I bypass that error and send my appexchange to Salesforce for the security review?

- Why do I get that error after installing my appexchange?


Thanks for help