SQL Server 2016 new Reporting Services web portal has replaced Report Manager. The new web portal lives in the RSWebApp folder but doesn't use the same ASP.NET framework.
Dynamics AX setup now covers this scenario while configuring the web portal.
A supported hotfix is available from Microsoft. There is a "Hotfix download available" section at the top of this Knowledge Base article. If you are encountering an issue downloading, installing this hotfix, or have other technical support questions, contact your partner or, if enrolled in a support plan directly with Microsoft, you can contact technical support for Microsoft Dynamics and create a new support request. To do this, visit the following Microsoft website:
https://mbs.microsoft.com/support/newstart.aspx You can also contact technical support for Microsoft Dynamics by phone using these links for country specific phone numbers. To do this, visit one of the following Microsoft websites:
https://mbs.microsoft.com/customersource/support/information/SupportInformation/global_support_contacts_eng.htmIn special cases, charges that are ordinarily incurred for support calls may be canceled if a Technical Support Professional for Microsoft Dynamics and related products determines that a specific update will resolve your problem. The usual support costs will apply to any additional support questions and issues that do not qualify for the specific update in question.
If you have customizations for one or more of the methods or the tables that are affected by this hotfix, you must apply these changes in a test environment before you apply the hotfix in a production environment.
For more information about how to install this hotfix, click the following article number to view the article in the Microsoft Knowledge Base:
893082 How to install a Microsoft Dynamics AX hotfix
You must have one of the following products installed to apply this hotfix:
Microsoft Dynamics AX 2012 R3
You must restart the Application Object Server (AOS) service after you apply the hotfix.
The global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.