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Cannot create attachments using graph API, cannot access any endpoints using the common endpoint.

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Posted on by CU13081944-0

I'm working on a custom API that can create different resources based on a customer's input. Users are able to login using OAuth 2.0 and with the token retrieved from that login process I'm able to create various resources in their selected company. All of the API calls use the Graph API endpoint described here (https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/api-reference/v2.0/endpoints-apis-for-dynamics) and that has worked very well so far but according to the Microsoft Graph API Explorer, there is no supported endpoint for attachments (https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/api-reference/v2.0/resources/dynamics_attachment) or document attachments (https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/api-reference/v2.0/resources/dynamics_documentattachment). Adding attachments to the created resources is something that I need to support.

I tried to use common endpoint (https://api.businesscentral.dynamics.com/v2.0/production/api/v2.0) to create attachments but the token I'm supplying to the endpoint returns with a 401 status and says that "The credentials provided are incorrect". Is it possible to use the common endpoint and have users authenticate using OAuth?

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Dynamics 365 Business Central

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YUN ZHU 95,331 Super User 2025 Season 2 on at

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Please note that the endpoints of the graph API and BC are different. I hope the following information can give you some tips.

Dynamics 365 Business Central Blog Series: Integrate Business Central with SharePoint

https://yzhums.com/63735/

Thanks.

ZHU

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CU13081944-0 18 on at

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Thank you for the response. Unfortunately, I don't know if those suggestions will fit my use case. I do not think it is possible for me to use AL for my solution as I will not have direct access to the Business Central tenant of the users since it is a multi tenant solution where we do not know the tenants beforehand. That is why I am trying to accomplish everything over Graph API calls.

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YUN ZHU 95,331 Super User 2025 Season 2 on at

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If the standard API does not meet your needs, you can customize one and associate it with the following tables and fields.

Hope this can give you some hints.

Thanks.

ZHU

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Sohail Ahmed 11,136 Super User 2025 Season 2 on at

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Attachments aren’t supported in the standard BC API — the endpoints are read-only. To add files you’ll need either an OData service or a custom AL API. The 401 you get on the common endpoint is expected, since create for attachments isn’t supported there.

✅ Mark this as the verified answer if helpful.

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