Sky customers received emails from Sky informing them that they need to reset their passwords as it was targeted in a breach incident.
Sky suffered a breach of email accounts and this password reset is part of the incident that happened.
TPRM report: https://scoringcyber.rankiteo.com/company/sky
"id": "sky1546291222",
"linkid": "sky",
"type": "Breach",
"date": "07/2019",
"severity": "50",
"impact": "2",
"explanation": "Attack limited on finance or reputation"