Some additional information.
On 24/01/2022 11:58, Benno Overeinder wrote:
* What exactly did you do (or not do) that was effective (or
ineffective)?
I have looked at the apache2 log files and checked the /etc/php and
/etc/davical directories if there were any references to php7 instead
of php/php8. The apache2 log file reported
[Mon Jan 24 11:29:29.678647 2022] [php:notice] [pid 684] [client /IPv6 address/]
davical: LOG: response:-->DAViCal Fatal Error
The macOS Calendar application warned with the error message:
“500” to operation CalDAVAccountRefreshQueueableOperation