Question 1
Login to the SSRS Report Manager.
Add the SSRS Report Manager URL to Local Intranet Zone in Internet Explorer.
Manage SQL Server Reporting Service 2019 Permissions.
For more information ,please refer to : https://spgeeks.devoworx.com/ssrs-2016-you-are-not-allowed-to-view-this-folder-contact-your-administrator-to-obtain-the-necessary-permissions/
Question 2
You could refer to: How to install custom security extensions.
In order to better resolve the issue, we suggest one case for one issue. Thanks for understanding.
Regards,
Joy
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