I have been trying everything I can think of to help with the error sync failed for inbox invalid datetime format 1366. I have tried ALTER DATABSE for the utf8mb4 unicode. Not sure what else to do or if it is something completely different. nextcloud 24.02 and php 8.1
Double check with Enabling MySQL 4-byte support — Nextcloud latest Administration Manual latest documentation
That was one of the first things I did, everything is set correctly there