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Business Central API Connection - The credentials provided are incorrect

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Posted on by AmplioSolutions

Hi All,

Thanks in advance for anyone that might help me. I've read as many posts as I can find on this subject but unfortunately none of these are helping me.

I have setup POSTMAN and a Python script to access the REST api from Business Central with partial success and i'm confused.

I have setup everything I can find within Azure, the App, all the secrets, client id's etc. I've setup some role permissions and granted consent etc

I have setup POSTMAN, I can retrieve a token successfully which is great and shows I'm using the right information however when I try to use that token and retrieve anything from Business Central it tells me that "the Credentials Provided are incorrect".

The URL i'm trying to get is: https://api.businesscentral.dynamics.com/v2.0/[My TenantID]/Sandbox/api/v2.0/companies

If anyone can help me diagnose and fix the issue id be very grateful.

Thanks

Lee

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DAnny3211 11,391 on at

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RE: Business Central API Connection - The credentials provided are incorrect

hi

look this

danieleincalza.blogspot.com/.../oauth20-business-central-app.html

danieleincalza.blogspot.com/.../business-central-bye-bye-basic.html

DAniele

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AmplioSolutions 21 on at

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RE: Business Central API Connection - The credentials provided are incorrect

Thanks Daniele,

I can successfully retrieve a token, I cannot create anything like your post as I don’t have the company to send the request too… hence why I am trying to retrieve the company list.

I don’t understand why it’s saying my credentials are incorrect

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DAnny3211 11,391 on at

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RE: Business Central API Connection - The credentials provided are incorrect

hi

look this

https://www.kauffmann.nl/2022/02/23/configuring-business-central-for-azure-active-directory-authentication-and-oauth-2/

DAniele

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AmplioSolutions 21 on at

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RE: Business Central API Connection - The credentials provided are incorrect

Thanks Daniele,

I have also completed this. My last resort is posting in this forum, if anyone can offer any troubleshooting advice I would be grateful

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Inge M. Bruvik 1,065 Moderator on at

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RE: Business Central API Connection - The credentials provided are incorrect

Have you checked the API's permissions inside Business Central so it actually can access the company list?

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YUN ZHU 93,880 Super User 2025 Season 2 on at

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RE: Business Central API Connection - The credentials provided are incorrect

Hi, I just tested it and it seems to work fine.

My test endpoint:

api.businesscentral.dynamics.com/.../companies

More details: https://yzhums.com/20690/

Hope this helps.

Thanks.

ZHU

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AmplioSolutions 21 on at

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RE: Business Central API Connection - The credentials provided are incorrect

Thank you Inge, I do feel like this is where the issue lies but I'm struggling to pinpoint the problem.

So I have gone to Azure Active Directory page in business central, created an entry using my Client ID, given it permissions for D365 BUS FULL ACCESS and enabled it. Then clicked the Grant Consent button which successfully granted.

I'm not sure if there's anything else I need to do? If there is (and i'm hoping there is) I think this will be the missing piece of the puzzle.

Regards

Lee

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