Broadcast links changed

Hello,
Last week our newsletter links went via https://de288.keap-link014.com/v2/click/
And now on our test newsletter this week they are going via https://is-tracking-link-api-prod.appspot.com/api/v1/click/… which are being flagged for some users as a malicious website.

Has anyone else had this change recently, and is there a way around it?