Hi @Lance ,
Welcome to Microsoft Q&A forum.
Maybe IntelliSense mode(tab-only IntelliSense completion) doesn’t work for Lua files. But please try to set this option first: Tools > Options > Text Editor > Advanced > Default IntelliSense completion mode > change from Automatic to Tab-only. If this option still doesn't work, I suggest you directly report this issue on our Developer Community.
Best Regards,
Tianyu
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