ICS invitation update not reflected in iphone email & calendar
I recieve an email with a .ics invitation, I open it from email, and accept it.
It is added into my iphone-linked GCAL.
All good.
Sender then updates the invite time on their system and I receive a new .ics.
When I open this new .ics from the email on my iphone, it still has the original date/time shown - wrong!!
I cannot update the date time, nor delete the orignial invitation from my GCAL linked calendar.
When I open this .ics in my mail account via the web, it has the correct new time shown.
If I accept it on the web, everything works fine.
This is clearly not a sender issue ( the sender's .ics is correctly configured and I can add it correctly via web).
It is clearly an iphone .ics processing issue.
What setting do I need to change on my iphone 5S with ios 8.4.1. to make sure that updated ics invitations actually show correctly, and so that I can accept them?
Please fix/advise.
Thank you
iPhone 5s, iOS 8.4.1, null