Promtail __path__ matches nothing, while files actually exist

Hello everyone,
please assist me in finding a root cause of the following behaviour:

I’m trying to configure promtail 2.4.2

promtail, version 2.4.2 (branch: HEAD, revision: 525040a32)
  build user:       root@5d9e7a4c92e6
  build date:       2022-01-12T16:48:53Z
  go version:       go1.16.2
  platform:         linux/amd64

Installed it as a systemd service:

[Unit]
Description=promtail
After=network-online.target

[Service]
Restart=always
RestartSec=5
TimeoutSec=5
User=promtail
Group=promtail
ExecStart=/usr/local/bin/promtail -config.file=/etc/promtail/config.yml -log.level=debug

[Install]
WantedBy=multi-user.target

Nothing appeared in Loki so I had enabled debug log_level.
That gave me messages like:

no files matched requested path, nothing will be tailed

for all configured patterns.
my config:

server:
  grpc_listen_port: 0
  http_listen_port: 9080


positions:
  filename: /var/lib/promtail/positions.yml


clients:
  - url: http://192.168.152.23:3100/loki/api/v1/push


scrape_configs:
  - file_sd_configs:
    - files:
      - /etc/promtail/file_sd/*.yml
      - /etc/promtail/file_sd/*.yaml
      - /etc/promtail/file_sd/*.json
    job_name: file_sd

  - job_name: tz_elastic-json
    pipeline_stages:
    - json:
        expressions:
          cluster: cluster.name
          component: component
          level: level
          message: message
          node: node.name
          timestamp: timestamp
          type: type
    static_configs:
    - labels:
        __path__: /var/log/elasticsearch/*server.json
        host: tz-elastic-master-1
        instance: 192.168.152.211
        job: tz_elastic
  - job_name: tz_elastic-log
    static_configs:
    - labels:
        __path__: /var/log/elasticsearch/*.ru.log
        host: tz-elastic-master-1
        instance: 192.168.152.211
        job: tz_elastic
  - job_name: tz_elastic-gc-log
    static_configs:
    - labels:
        __path__: /var/log/elasticsearch/gc.log
        host: tz-elastic-master-1
        instance: 192.168.152.211
        job: tz_elastic

files actually exist:

root@tz-elastic-master-1:/var/log/elasticsearch# ls {gc.log,*server.json,*.ru.log}
gc.log  tz-elasticsearch.int.mycompany.ru.log  tz-elasticsearch.int.mycompany.ru_server.json

Also I’ve tested glob library separately github.com/bmatcuk/doublestar


and it seems to be OK.

Please advise what else should I check? Is there any issue in my configuration?

Managed to solve the issue.
Promtail user had no access to target path and for some reason there’s no error log message on ‘permission denied’.