GitLab Code coverage statistics data is empty and Coverage report shows coverage: unknown badges

I'm using Jacoco for code coverage and visualizing it, visualizing is working well but Code coverage statistics data is empty and the coverage badge is unknown. The gitlab-ci file for the test is:

test-ut:
  stage: test
  image: maven:3.6.3-jdk-11
  script:
    - mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent -Dgroups="unit-test" test jacoco:report
  artifacts:
  paths:
    - target/site/jacoco/jacoco.xml
    - target/site/jacoco/index.html
  coverage: '/Total.*?([0-9]{1,3})%/'