Constant popup on my iPhone in multiple versions of IOS now, Cannot verify server identity "outlook.office.365.com"
iPhone 15 Pro, iOS 18
Are you using Microsoft Exchange/365 for your mail and/or calendar? If so, have you tried removing the account and re-adding it?
Go to your Calendar app and look at the list of calendars. You may have inadvertently been subscribed to an unwanted calendar of some sort. Check the list and delete any you do not recognize or do not with to be subscribed to.
Regards.
thank you for the reply. I have only a single exchange calendar and it is correct.
Cannot verify server identity
