Cannot attach a CDM folder to a new dataflow

[jakubpetr]

Creating a new dataflow from a Common Data Model folder fails with the following

Power BI can't access your organization's Azure Data Lake Storage Gen2 account. Please ask your administrator to restore access, and try again.

I'm the administrator. What do I need to do to "restore access?" Is it necessary to enable "Dataflow storage (preview)" in the workspace settings to be able to create dataflows from CDM folders?

Here's a screenshot of the error. It looks like the Power BI permissions aren't correctly set, but Power BI has the required access to the powerbi file system, as seen here (I know the permissions for "Other" and the other Power BI-related services are also required, but I set them all in accordance with the documentation). It also has a Reader role in the storage account.

[v-shex-msft]

HI @jakubpetr ,

CDM is azure based service and power bi service is based on office 365.
The permission you mention is Power Bi admin permission(office 365), it does not work on the Azure side. I think you need Azure AD account with corresponding permissions to operation on CDM.

Regards,
Xiaoxin Sheng

[jakubpetr]

Also, I am now getting a new error when I try to create a dataflow with a CDM folder:

Something went wrong
Could not perform this operation due to an internal error
Please try again later or contact support. If you contact support, please provide these details.
Activity ID: 5d75fe73-e964-40ee-8358-b7efffe8a1ad
Request ID: af2ca1a6-8585-640f-675b-7cafaf5116eb
Correlation ID: 14d0ac5d-f638-5b82-0e13-d4f59062e266
Status code: 404
Time: Fri Dec 06 2019 15:48:45 GMT+0100 (Central European Standard Time)
Service version: 13.0.11499.187
Client version: 1911.3.022
Cluster URI: https://wabi-west-europe-b-primary-redirect.analysis.windows.net/

Here is a screenshot. Notice the status code is 404, whereas I previously encountered 400 in this issue and was not given a status code at all in the original post of this thread. Do these status codes represent HTTP status codes? Does 404 mean "not found?" Power BI's error messages have thus far sadly been utterly unhelpful.

[jakubpetr]

This indeed doesn't appear to be a permission issue. I can create a regular dataflow backed by a table just fine, Power BI can use it and I can see it in the Storage Explorer. Yet, trying to attach a CDM folder in the same filesystem - literally right next to the folder created by Power BI - fails with the aforementioned error.

[somears]

Were you able to resolve this issue? We're getting the same 404 error when attaching a CDM folder. 

[jakubpetr]

Thanks, @v-shex-msft, but what's the permission you're talking about? Where can I find it? I was able to find my Azure AD account for office 365 in the 365 admin centre, but I have no idea what's the relationship between the 365 AD account and the Azure services I'm trying to integrate Power BI with. I supposed Power BI was linked to my Azure storage account, since it says so in the settings (see here), and I set up the permissions as required by the documentation. How do I add the permissions you speak of to the Azure AD account?