Symptom
When using the occ user:sync command you get the following message The backend <OCA\User_LDAP\User_Proxy> does not exist. Did you forget to enable the app?
Environment
owncloud 10.x
Steps to reproduce
1.Run the occ user:sync command (manually or within a cron job)
2.Notice the message/notification : The backend <OCA\User_LDAP\User_Proxy> does not exist. Did you forget to enable the app?
Cause
Possibles causes :
The backend used is with wrong quotes. For example “OCA\User_LDAP\User_Proxy” instead of “OCA\User_LDAP\User_Proxy”
Something is wrong with the occ script used
Solution/Workaround
Make sure the backend used is with the correct quotes " : “OCA\User_LDAP\User_Proxy”
Make sure the occ script used is correct. For this, you can try our ansible script for troubleshooting owncloud/templates/usr/local/bin/occ.j2 at main · owncloud-ansible/owncloud · GitHub
References