Make sure you have a good reason for the check. It will only be accepted to counter vandalism or disruption to Wikimedia wikis. Valid reasons include needing a block of the underlying IP or IP range, disruptive sockpuppetry, vote-stacking, and similar disruption where the technical evidence from running a check would prevent or reduce further disruption.
Be specific in your reasons. Ambiguous or insufficient reasons will cause delays. Explain the disruption and why you believe the accounts are related, ideally using diff links or other evidence.
Make sure there are no local checkusers or policies.
Reason(s): Continuous disruption in local featured content votings using multiple accounts. Appears to waste contributive capacity of the community as a whole. Behavorial evidence proved likely, but would like a CU check to verify. Also please do a sleeper check. 無聊龍 (talk) 16:36, 19 April 2019 (UTC)