Hello, at the first go to project settings from Edit menu
1- Engine-> Rendering-> Global Illumination: sit on [Screen Space(Beta) ]
2- Engine-> Rendering-> Reflections: Support global plane for Planar Reflection: set On
3- Search [motion]: set Off
4- Make mirror material and search Reflection, set On: High quality Reflection & Planar Reflection
5- Put Planar Reflection in front of mirror,
6- Go details, set value of Normal Distortion Strength & Prefilter to [ 0 ]
7- Set value Screen Percentage to [100]
**Congratulation **
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