nelmio_security_report:
    path: /nelmio/csp/report
    defaults: { _controller: nelmio_security.csp_reporter_controller:indexAction }
    methods: [POST]

nelmio_security_report:
    path: /csp/report
    defaults: { _controller: nelmio_security.csp_reporter_controller:indexAction }
    methods: [POST]

Remove /nelmio from CSP report path.
Remove /nelmio from CSP report path.
