Realised where I was going wrong. I was copying the TemplateDefs file from the FP_FirstPerson. I instead copied the one from TP_FirstPerson and all is good.
TemplateDefs:
[/Script/GameProjectGeneration.TemplateProjectDefs]
LocalizedDisplayNames=(Language=“en”,Text=“Sim Game”)
LocalizedDescriptions=(Language=“en”,Text=“A template project to create sim game.”)
ClassTypes=Character, GameMode, HUD, Actor
AssetTypes=Animation Sequence, Animation Montage, Sound Wave, Skeletal Mesh, Animation Blueprint, Skeleton, Static Mesh, Texture.
FoldersToIgnore=Binaries
FoldersToIgnore=Build
FoldersToIgnore=Intermediate
FoldersToIgnore=Saved
FoldersToIgnore=Media
FilesToIgnore="%TEMPLATENAME%.uproject"
FilesToIgnore="%TEMPLATENAME%.png"
FilesToIgnore=“Config/TemplateDefs.ini”
FilesToIgnore=“Config/config.ini”
FilesToIgnore="%TEMPLATENAME%.opensdf"
FilesToIgnore="%TEMPLATENAME%.sdf"
FilesToIgnore="%TEMPLATENAME%.v11.suo"
FilesToIgnore="%TEMPLATENAME%.v12.suo"
FilesToIgnore="%TEMPLATENAME%.sln"
FilesToIgnore=“Manifest.json”
FilesToIgnore=“contents.txt”
FolderRenames=(From=“Source/%TEMPLATENAME%”,To=“Source/%PROJECTNAME%”)
FolderRenames=(From=“Source/%TEMPLATENAME%Editor”,To=“Source/%PROJECTNAME%Editor”)
FilenameReplacements=(Extensions=(“cpp”,“h”,“ini”,“cs”),From="%TEMPLATENAME_UPPERCASE%",To="%PROJECTNAME_UPPERCASE%",bCaseSensitive=true)
FilenameReplacements=(Extensions=(“cpp”,“h”,“ini”,“cs”),From="%TEMPLATENAME_LOWERCASE%",To="%PROJECTNAME_LOWERCASE%",bCaseSensitive=true)
FilenameReplacements=(Extensions=(“cpp”,“h”,“ini”,“cs”),From="%TEMPLATENAME%",To="%PROJECTNAME%",bCaseSensitive=false)
ReplacementsInFiles=(Extensions=(“cpp”,“h”,“ini”,“cs”),From="%TEMPLATENAME_UPPERCASE%",To="%PROJECTNAME_UPPERCASE%",bCaseSensitive=true)
ReplacementsInFiles=(Extensions=(“cpp”,“h”,“ini”,“cs”),From="%TEMPLATENAME_LOWERCASE%",To="%PROJECTNAME_LOWERCASE%",bCaseSensitive=true)
ReplacementsInFiles=(Extensions=(“cpp”,“h”,“ini”,“cs”),From="%TEMPLATENAME%",To="%PROJECTNAME%",bCaseSensitive=false)
SharedContentPacks=(MountName=“FirstPerson”,DetailLevels=(“Standard”))
SharedContentPacks=(MountName=“Geometry”,DetailLevels=(“Standard”,“High”))