Recent DiscussionsMost RecentNewest TopicsMost LikesSolutionsTagged:TagRe: Sent from Outlook for iOS links Being Quarantined in Defender Long story short, looks like our issue might have been caused by an external vendor accidentally adding an incorrect Defender Tenant Block rule.. It's been a painful cleanup! Re: Sent from Outlook for iOS links Being Quarantined in DefenderThe issue is occurring again and causing massive impact! Yesterday, today and ongoing we are suddenly seeing any emails that contain the link https://aka.ms/o0ukef being quarantined as 'High Confidence Phish'.