SSRS 2019 permissions granted to user domain\user are insufficient

Reporting Services Error

The permissions granted to user 'DOMAIN\user' are insufficient for performing this operation. (rsAccessDenied) Get Online Help

I had this issue in the past with Windows 10 and the solution was to run it in IE 11 under administrator as per this article:

https://learn.microsoft.com/en-us/answers/questions/453441/the-permissions-granted-to-user-domainuser-are-ins

As IE 11 is not available anymore I am struggling to get this working.

I tried re-installing my instance of SSRS, re-setting up the WebService URLs, creating a new ReportServer database in SQL Server and configuring the Report Server database credentials in the Report Server Configuration Manager. This didn't work.

I also tried going into the users and policyuserrole tables in the ReportServer database and manually added my account and SSRS roles to it. This didn't work.

The Report Manager url doesn't allow me access anything or make security changes.

My account is the only administrator on this machine and is inside the Administrators group.

Can anyone help me get this working? Is there something specific to my environment that could be causing this?

Thanks to the answers given in the comments.

The issue came about due to my computer being part of a work domain with a different user SID.

To get it working for now:

1. Created a local account.
2. Added the site to Trusted Sites in Internet Options, the browser then prompts for a username and password when accessing the Reports Manager site and it works with the local account.