topic Re: Using the Power BI Authentication API returns accessToken null in Custom Visuals Development Discussion

Using the Power BI Authentication API returns accessToken null

Anonymous — Thu, 02 May 2024 09:28:59 GMT

I'm developing a custom visual for Power BI, and I'm trying to use the Authentication API (https://learn.microsoft.com/en-us/power-bi/developer/visuals/authentication-api). I wrote this function:

const authenticate = () => { props.host.acquireAADTokenService.acquireAADTokenstatus().then((acquireTokenStatus) => { console.log('allowed?', acquireTokenStatus) if (acquireTokenStatus === powerbi.PrivilegeStatus.Allowed) { props.host.acquireAADTokenService .acquireAADToken() .then((acquireAADTokenResult: AcquireAADTokenResult) => { console.log('access token', acquireAADTokenResult) if (acquireAADTokenResult.accessToken) { getDatasetInfo(acquireAADTokenResult.accessToken, props.datasetId).then((createdDataset) => setDataset(createdDataset), ) } }) } }) }

It logs `allowed? 0`, meaning the privilege is allowed in the project, and then the accessToken is always null. I enabled the option of obtaining Entra ID tokens (https://learn.microsoft.com/en-us/fabric/admin/organizational-visuals#obtain-microsoft-entra-access-token). I also added the privileges to the project, with the url I configured in my Azure application

{ "privileges": [ { "name": "WebAccess", "essential": true, "parameters": ["*"] }, { "name": "ExportContent", "essential": true }, { "name": "AADAuthentication", "parameters": ["https://mywebsite.com"] } ],

I also added permissions in the Azure application and I tried adding localhost as a URI redirect.

From what I understood this should be working. What's missing?

Re: Using the Power BI Authentication API returns accessToken null

pramodcog — Fri, 17 Jan 2025 08:35:14 GMT

@Anonymous I am facing same issue while using Power BI Authentication API, did you manage to find a solution?

Re: Using the Power BI Authentication API returns accessToken null

Anonymous — Sat, 18 Jan 2025 15:27:57 GMT

No, and I actually received a response from Microsoft saying they actually don't enable the same credentials for Power BI and for this API, so as of 6 months ago it was simply not possible.

Re: Using the Power BI Authentication API returns accessToken null

pramodcog — Sat, 18 Jan 2025 21:39:00 GMT

Oh ok, how did you manage to get access token or is their any other alternative?

Re: Using the Power BI Authentication API returns accessToken null

lbendlin — Mon, 20 Jan 2025 04:16:30 GMT

Use the custom connector. It implements AAD auth.

Re: Using the Power BI Authentication API returns accessToken null

pramodcog — Tue, 21 Jan 2025 10:10:33 GMT

I am very new to PowerBI and custom visual, would be helpful if you can share an example how custom connectors can be linked to custom visual for authentication, if its not an overhead!!

Re: Using the Power BI Authentication API returns accessToken null

lbendlin — Tue, 21 Jan 2025 13:39:27 GMT

Sorry, my reply was for Power Query, not for custom visuals.

Re: Using the Power BI Authentication API returns accessToken null

pramodcog — Tue, 21 Jan 2025 14:43:21 GMT

Oh ok, how did you manage to get access token or is their any other alternative?

Re: Using the Power BI Authentication API returns accessToken null

lbendlin — Tue, 21 Jan 2025 20:15:23 GMT

You register an app in Azure that asks for the (non-delegated) permissions for whatever API calls you need to do.

Re: Using the Power BI Authentication API returns accessToken null

pramodcog — Mon, 27 Jan 2025 17:15:07 GMT

I have managed to get the acces token, there were lot of setting to be done.
Now I am trying to acheive a token exchange in backend for https://login.microsoft******, but I am blocked by the CORS error even though I have added the URL into privilages parameter in capabilities.json file.
I have read CORS limitation , is there a alternate workaround for token exchange?

Re: Using the Power BI Authentication API returns accessToken null

ViktorDidyk — Fri, 19 Sep 2025 16:49:28 GMT

Hello, is there a possibility that you remember and can help me with the topic issue (accessToken: null). You said that there were a lot of settings to be done.
But which exactly? I have followed Microsoft documentation multiple times but without results.
I have tried to set permissions (User: ReadAll) as both delegated and application as mentioned in this thread.