Your patch file is at incorrect location, folder structure should be like -
in your case error is here -
put config folder inside your environment folder, such as sitecoreruntime > production > config > Sitecore.IdentityServer.Host.xml
There are probably hundreds of examples where using the z prefix can be seen. This is a convention followed to ensure that the patch is applied last.
Before Sitecore 9, using a folder or a file prefix with z was the best way to get your changes applied in the desired order.
After Sitecore 9, there was introduced a new feature to apply configuration ...
Have you checked final values for this settings in showconfig.aspx I think your file is not getting patched properly.
You can use below steps.
Create a Config file with appropriate name, by using below lines.