notify_push could not be started via systemd at boot time

Hello,

Sadly, I did not succeed in starting notify_push automatically at boot time

systemd log:

Nov 12 19:57:49 obfuscated systemd[1]: Started notify_push.service - Push daemon for Nextcloud clients.
Nov 12 19:57:49 obfuscated systemd[1]: Stopping notify_push.service - Push daemon for Nextcloud clients...
Nov 12 19:57:49 obfuscated systemd[1]: notify_push.service: Deactivated successfully.
                                      *** the previous 3 protocol lines are repeated 5 times ***
Nov 12 19:57:49 obfuscated systemd[1]: notify_push.service: Start request repeated too quickly.
Nov 12 19:57:49 obfuscated systemd[1]: notify_push.service: Failed with result 'start-limit-hit'.
Nov 12 19:57:49 obfuscated systemd[1]: Failed to start notify_push.service - Push daemon for Nextcloud clients.

Setting debug for logging does not provide any further information either.
The content of my notify_push.service:

[Unit]
Description = Push daemon for Nextcloud clients
Documentation = https://github.com/nextcloud/notify_push
Wants = network-online.target apache2.service redis-server.service
After=network-online.target redis-server.service mariadb.service apache2.service php8.2-fpm.service

[Service]
Environment = PORT=7867
ExecStart = /mypath/apps/notify_push/bin/x86_64/notify_push /mypath/config/config.php
User=www-data

[Install]
WantedBy = multi-user.target

ubuntu 23.10

Start by reproducing the boot-time failure with the shown notify_push.service on Ubuntu 23.10, then inspect its systemd journal and the configured ExecStart command. Determine why the service exits and hits start-limit-hit; done means notify_push remains running after boot without repeated start failures.