It can be useful to use Edge browser on Windows Server 2016 to open a page or a Failover cluster report before creating it. But, for security reasons, the browser cannot be opened because you are using the built-in administrator account.
To allow this operation, you can simply edit the local security policy. Start by opening a run command and execute this : secpol.msc
Under Local Policies/Security Options navigate to “User Account Control Admin Approval Mode for the Built-in Administrator account”
Change the default value with Enable.
Then restart your computer.