Using objects from components in arrays of other object

Your schemas look correct. Make sure there are no extra nesting levels in the schemas. Check this example for the reference:

openapi: 3.0.0
info:
  title: Array of objects
  version: 1.0.0
paths:
  /something:
    post:
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/addresses'
      responses:
        200:
          description: OK

components:
  schemas:

    addresses:
      type: object
      properties:
        addresses:
          type: array
          items:
            $ref: '#/components/schemas/address'

    address:
      type: object
      description: A user's address
      properties:
        country:
          type: string
        country_subject:
          type: string