ldap_write_support not working with nextcloud 29.0.0.19

I'm new to nextcloud and have a fresh install of 29.0.0.19 with and ldap backend for users. authentication is working as expected and verified to be coming from LDAP. When I enable ldap_write_support, I immediately start seeing the following errors in my logs:

{"reqId":"pS4lTGpVaUwGwesjMBNL","level":4,"time":"2024-05-19T18:52:26+00:00","remoteAddr":"XXX.XXX.XXX.XXX","user":"--","app":"no app in context","method":"GET","url":"/remote.php/dav/","message":"Could not boot user_ldap: No LDAP provider is available","userAgent":"Nextcloud Server Crawler","version":"29.0.0.19","exception":{"Exception":"Exception","Message":"No LDAP provider is available","Code":0,"Trace":[{"file":"/mnt/data/var/nextcloud/html/lib/private/Server.php","line":1083,"function":"getLDAPProvider","class":"OC\\LDAP\\NullLDAPProviderFactory","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":175,"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/mnt/data/var/nextcloud/html/3rdparty/pimple/pimple/src/Pimple/Container.php","line":122,"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":142,"function":"offsetGet","class":"Pimple\\Container","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/ServerContainer.php","line":173,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":445,"function":"query","class":"OC\\ServerContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":96,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":120,"function":"array_map"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":128,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":146,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":470,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":442,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":96,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":120,"function":"array_map"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":128,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Utility/SimpleContainer.php","line":146,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":470,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/ServerContainer.php","line":155,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/EventDispatcher/ServiceEventListener.php","line":70,"function":"query","class":"OC\\ServerContainer","type":"->"},{"file":"/mnt/data/var/nextcloud/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php","line":230,"function":"__invoke","class":"OC\\EventDispatcher\\ServiceEventListener","type":"->"},{"file":"/mnt/data/var/nextcloud/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php","line":59,"function":"callListeners","class":"Symfony\\Component\\EventDispatcher\\EventDispatcher","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/EventDispatcher/EventDispatcher.php","line":86,"function":"dispatch","class":"Symfony\\Component\\EventDispatcher\\EventDispatcher","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/EventDispatcher/EventDispatcher.php","line":98,"function":"dispatch","class":"OC\\EventDispatcher\\EventDispatcher","type":"->"},{"file":"/mnt/data/var/nextcloud/html/apps/user_ldap/lib/AppInfo/Application.php","line":143,"function":"dispatchTyped","class":"OC\\EventDispatcher\\EventDispatcher","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Bootstrap/FunctionInjector.php","line":66,"function":"OCA\\User_LDAP\\AppInfo\\{closure}","class":"OCA\\User_LDAP\\AppInfo\\Application","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Bootstrap/BootContext.php","line":50,"function":"injectFn","class":"OC\\AppFramework\\Bootstrap\\FunctionInjector","type":"->"},{"file":"/mnt/data/var/nextcloud/html/apps/user_ldap/lib/AppInfo/Application.php","line":147,"function":"injectFn","class":"OC\\AppFramework\\Bootstrap\\BootContext","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/AppFramework/Bootstrap/Coordinator.php","line":200,"function":"boot","class":"OCA\\User_LDAP\\AppInfo\\Application","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/App/AppManager.php","line":437,"function":"bootApp","class":"OC\\AppFramework\\Bootstrap\\Coordinator","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/App/AppManager.php","line":216,"function":"loadApp","class":"OC\\App\\AppManager","type":"->"},{"file":"/mnt/data/var/nextcloud/html/lib/private/legacy/OC_App.php","line":128,"function":"loadApps","class":"OC\\App\\AppManager","type":"->"},{"file":"/mnt/data/var/nextcloud/html/remote.php","line":155,"function":"loadApps","class":"OC_App","type":"::"}],"File":"/mnt/data/var/nextcloud/html/lib/private/LDAP/NullLDAPProviderFactory.php","Line":36,"message":"Could not boot user_ldap: No LDAP provider is available","exception":{},"CustomMessage":"Could not boot user_ldap: No LDAP provider is available"}}

But I do in fact have an LDAP provider configured and working.

I've been digging into the code and have not been able to determine what the exact problem is. I suspect maybe things have changed in nextcloud that have caused this to become an issue as I am sure others have been working just fine.

I'll continue to poke and it and if I can find a solution, I will update this.

Start with apps/user_ldap/lib/AppInfo/Application.php and lib/private/LDAP/NullLDAPProviderFactory.php, then reproduce the logged failure with ldap_write_support enabled on Nextcloud 29.0.0.19. Done means identifying why the configured LDAP provider is unavailable during boot and correcting the failure without breaking LDAP authentication.