Unable to sync Calendar App after iOS 18 update

After downloading latest update my Yahoo account was popping up with a constant reminder to go to settings and sign in. After signing in all my calendar events coded the color of the yahoo account name have disappeared off my calendar. I'm missing appts and clients. I tried deleting Yahoo from calendar, rebooting and reloading. Still all gone.

Thank you @Kimowaggs! I missed a very important meeting not realizing that my calendar had stopped syncing. No help at all from Apple support, or from general web searching. Your clear guidance helped me finally fix the problem!

Reading through all of these comments. Just did update on my computer. This is where I keep a shared calendar for my partner and myself for our business. I am seeing the proper appointments, he is not. His phone is operating on the latest update.

This is so frustrating because he almost missed an appointment (just ended up running late) today.

I am currently trying the suggestion that started this thread. I have tried adding every conceivable email in hopes that one of those would catch the calendar. I have had him close and restart his phone.

PLEASE SEND HELP!

I have tried every solution and calendar will not work, I cannot send an event for my wife’s devices, much less my own being reliable! Everything worked ok until iOs 18.3 and all we get from Apple is silence! I have been a die hard Apple fan for years, but starting to think it is time to cut the chord if Apple refuse to support their own updates!

Any update? Less than a handful of items will load on my calendar. I’ve checked my settings. Help!

Since updating to IOS 18, all my calendar entries have disappeared. I don’t even have bank/public hols either. Any update from Apple how to fix this?

Im having the exact same issue yall, has apple fixed this yet? 🤬

Same here. I quit all calendars on devices thinking they would update. Not only no sync now I have lost dates.

I use google calendar for work and 2 businesses. Since the IOS 18 update, my entire Google Calendar has gone blank. I am beyond lost and ready to explode 🤬🤬🤬

I don't see any reply from Apple. Am I missing it?? Same issue. Impacting my business

Same here. Any updates?

Same problem. Moved from my old IPad Air 2 to new IPad Air. IOS18. All calendar entries transferred ok but new entries do not show up on my Google calendar.

I have to wonder what 'calendar' iTunes is saying it is syncing to on my pc, as, obviously, it's not working!

Me too, Apple 12 Pro max calendar is useless, Apple please fix this!!!!

Just looked at what you mentioned and have no verification notice anywhere. Glad you solved yours!