Project Online API Usage: authentication challenge

Question

Good evening,

I am now struggeling for the past hours to get a use case up and running: I need to retrieve (read-only) the assigned resources for a project task.

The only neutral way I found to accomplish this so far is through ODate REST API which listens like this

http://ServerName/ProjectServerName/_api/ProjectData/Projects

More precisely my query is the following

"https://" + sharepoint_url + "/sites/pwa/_api/ProjectServer/Projects('" + project_id + "')/Assignments('" + project_task_id + "')/Resource"

Now what I am challenges with, is the right authentication.

I am trying to impersonate two natural users, the application is registered in AAD and I also get a token.

But I get either one of the two errors

{"error_description":"Unsupported security token."}

or

{"error_description":"Exception of type 'Microsoft.IdentityModel.Tokens.AudienceUriValidationFailedException' was thrown."}

I am happy to provide further details, but I am a bit lost in the API jungle from Microsoft. Unfortunately it appears that Graph API does not (yet?) support Project Online.

Answer 1

Hi @Philipp Reske ,
Currently, Microsoft Q&A supports the products listed over here: supported topics (more to be added later on).

Your question about Project is not supported yet now. You could ask about this in Project forums.
https://techcommunity.microsoft.com/t5/project/ct-p/Project

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Answer 2

I was already following those guides here:

• https://learn.microsoft.com/de-de/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow
• http://pratapreddypilaka.blogspot.com/2018/05/sharepoint-online-authentication-for.html

No positive result. I do get tokens, but the errors remain.

Answer 3

Ok, also asked it now in the Project Techcommunity: https://techcommunity.microsoft.com/t5/project/accessing-project-rest-api-throws-error-exception-of-type/m-p/3021395#M2498

Thank you for the hint.