Response to the Invitation Cannot Be Sent? 7 Fixes
Accepting a meeting invite is a message being sent, not a calendar action, so the failure is nearly always the account rather than Calendar.

Hi, I’m Isaac Smith, the founder and editor of PC Glance, a website dedicated to all things related to computers, laptops, and technology. Ever since I was a kid, I was fascinated by how these machines work and what they can do.
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Accepting a meeting invite is a message being sent, not a calendar action, so the failure is nearly always the account rather than Calendar.
The Control Center button disconnects your accessories, it does not switch the radio off, and Apple documents the 5 AM deadline that brings it back.
Apple says to retry the backup after each step, so this is a sequence rather than a list. Seven steps, computer first, phone second.
Merge All spins and gives up, or the duplicates option is not on screen at all. Two different faults, seven fixes, split by which one you have.
Apple gates cellular updating four ways and only mentions one. Model, data mode, release phase and a carrier that is allowed to say no.
The page usually arrived and something on the phone stopped it being drawn. Seven fixes aimed at what is filtering it.
Photos lists the iPhone and shows no pictures. Eight fixes, split by whether nothing imports or only the recent shots are missing.
Your iPhone deleted them and your mail server did not, so the next sync puts them back. Seven fixes that make both sides agree.
A red exclamation mark under Calendars and nothing new for days. Seven fixes, starting with the Fetch schedule that waits for a charger.
Apple documents exactly two causes and the internet lists about eight. This separates the documented two from the four owners report.