Exchange Web Services - Admin Account but without License

[Christle_Carabeo]

Hi,

Is there a way to call the Exchange Web Services using an unlicensed Exchange Administrator account [unlicensedexchangeadmin@test.com] to list all public folders? 

Scenario: Listing Public Folders

1. Using the Exchange Admin Center with the unlicensed Exchange Administrator account, I can list the public folders.

2. Using the EWS.GetFolder with the same credentials, ErrorNonExistentMailbox was returned and no folders were listed.

Thanks,

Christle

[#2]

@Christle_Carabeo 

Make sure the Administrator account running the EWS script has ApplicationImpersonation permissions.

Have you checked the below threads :

https://stackoverflow.com/questions/54635471/why-does-ews-api-returns-errornonexistentmailbox-error

https://cs.mailstore.com/index.php?/Knowledgebase/Article/View/112/4/ews-error-code-errornonexistent...

[#3]

Since the unlicensedexchangeadmin@test.com account doesn't have a license, adding it to the ApplicationImpersonation permission still returns ErrorNonExistentMailbox.