Could not load folder contents

[don075]

After installing and configuring power bi report server, I added a new user and assigned System Administrator role.
Followed instructions in "https://learn.microsoft.com/en-us/sql/reporting-services/security/grant-user-access-to-a-report-serv..."
I then created a folder and assigned Content Manager role to the user.

However, when I login to the web portal with the new account, I get the following message box
Could not load folder contents
You are not allowed to view this folder. Contact your system administrator to obtain the nexessary permissions.

I went back to the folder permission and assigned other roles. Still I get the same message and the folder is not available for the new user.
I have no idea how to fix this.
Any help is greatly appreciated.

[don075 · Accepted solution]

Found the solution in https://community.powerbi.com/t5/Report-Server/Access-to-the-home-folder/m-p/447630#M6239

Actually it's the same as for a subfolder. When you navigate to the Home page (https://<your server>/reports/browse=) as an administrator there's an option "Manage Folder" next to the options "New",  "Upload" and "Tiles". 

When you click that on "Manage Folder" you can set the security for the Home folder. Add those user(group)(s) with Browser-role to that folder.

[don075]

Also, the user that installed and configurred power bi server can login to the web portal without any issues and create accounts. Issue is newly created accounts get the prompt.