@AngieMc
You will probably find your messages are sending.
If you start your messages with *0# you will get a proper O2 delivery report.
There is a change in iOS 15 which doesn't work well with O2 hence the failed delivery message.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.
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