With a simple Web discussions link and an attachment: registry value linkplussimplediscussionsplusattachmentbodyUserHKCU\software\policies\microsoft\office\16.0\common\reviewcycle

Policy ID: L_WithasimpleWebdiscussionslinkandanattachment
Scope: User Configuration
Supported on: At least Windows Server 2008 R2 or Windows 7
Source: Microsoft 365 Apps / Office Administrative Templates (version 5568.1000)
Category: Microsoft Office 2016 › Collaboration Settings › Default message text for a review request...

Registry

linkplussimplediscussionsplusattachmentbody

REG_SZUser

HKCU\software\policies\microsoft\office\16.0\common\reviewcycle Current key

Enabled value: Depends on the option value
Element: With a simple Web discussions link and an attachment
Value type: REG_SZ

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\common\reviewcycle]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"linkplussimplediscussionsplusattachmentbody"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKCU\software\policies\microsoft\office\16.0\common\reviewcycle" /v "linkplussimplediscussionsplusattachmentbody" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKCU:\software\policies\microsoft\office\16.0\common\reviewcycle' -Force | Out-Null
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\common\reviewcycle' -Name 'linkplussimplediscussionsplusattachmentbody' -PropertyType String -Value '<enter value>' -Force | Out-Null