Can't find registered Python addon inside Blender 2.91.2 (tutorial example) I have exactly the same issue as here: Can&#39;t find my addon inside blender 2.90 (first addon).
But in my case adding the addon Category didn't work.
Following this tutorial https://docs.blender.org/manual/en/latest/advanced/scripting/addon_tutorial.html, after installing Blender 2.91.2 I put the following script in Text editor and run it:
bl_info = {
    &quot;name&quot;: &quot;Move X Axis&quot;,
    &quot;version&quot;: (1, 0),
    &quot;blender&quot;: (2, 91, 2),
    &quot;category&quot;: &quot;Object&quot;,
}

import bpy


class ObjectMoveX(bpy.types.Operator):
    &quot;&quot;&quot;My Object Moving Script&quot;&quot;&quot;      # Use this as a tooltip for menu items and buttons.
    bl_idname = &quot;object.move_x&quot;        # Unique identifier for buttons and menu items to reference.
    bl_label = &quot;Move X by One&quot;         # Display name in the interface.
    bl_options = {'REGISTER', 'UNDO'}  # Enable undo for the operator.

    def execute(self, context):        # execute() is called when running the operator.

        # The original script
        scene = context.scene
        for obj in scene.objects:
            obj.location.x += 1.0

        return {'FINISHED'}            # Lets Blender know the operator finished successfully.

def register():
    bpy.utils.register_class(ObjectMoveX)


def unregister():
    bpy.utils.unregister_class(ObjectMoveX)


# This allows you to run the script directly from Blender's Text editor
# to test the add-on without having to install it.
if __name__ == &quot;__main__&quot;:
    register()

Then, I look for it in the menu search with no success:

I don't find it in Edit -&gt; Preferences -&gt; Add-ons neither.
I tried putting &quot;blender&quot;: (2, 80, 0), like in the tutorial, removing &quot;version&quot;: (1, 0), , with no result so far.
Actually in the tutorial you have mentioned above, it's 'Operator Search' not 'Menu Search' which you opened but may not noticed. So to have a correct result, you need to enable 'Developer Extras' first.

Then you will get 'Operator Search' in Edit Menu.

With 'Operator Search', you can find your first addon.