Can't query for Metrics

Splunk Search

I have create a metric Index called "my_metric_index".
I see, that the index is populated with events.

I have added the role "metrics_user" and added the capability of "list_metrics_catalog" to the new role.
I have granted this role to my user, which has already sc_admin role.

When running command mcatalog values(metric_name) WHERE index="my_metric_index" I receive just:

4 errors occurred while the search was executing. Therefore, search results might be incomplete. Hide errors.
This command only searches event indexes. To search metric indexes, use the mstats command.

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