diff --git a/controllers/login.js b/controllers/login.js
index 519eb4efa8..7c6dd1ce05 100644
--- a/controllers/login.js
+++ b/controllers/login.js
@@ -318,10 +318,6 @@ const determineRedirectUrl = (req) => {
 	return '/dashboard';
 };
 
-const filterSchoolsWithLdapLogin = (schools) => schools
-// eslint-disable-next-line max-len
-	.filter((school) => school.systems?.some((system) => system.type === 'ldap' && !system.oauthConfig));
-
 async function getOauthSystems(req) {
 	return api(req, { version: 'v3' })
 		.get('/systems/public?onlyOauth=true')
@@ -338,7 +334,7 @@ router.all('/', async (req, res, next) => {
 		const oauthSystems = await getOauthSystems(req);
 
 		res.render('authentication/home', {
-			schools: filterSchoolsWithLdapLogin(schools),
+			schools,
 			systems: [],
 			oauthSystems: oauthSystems.data || [],
 			inline: true,
@@ -370,7 +366,7 @@ const renderLogin = async (req, res) => {
 
 	res.render('authentication/login', {
 		pageTitle: res.$t('home.header.link.login'),
-		schools: filterSchoolsWithLdapLogin(schools),
+		schools,
 		systems: [],
 		oauthSystems,
 		oauthErrorLogout,
@@ -446,27 +442,6 @@ router.get('/login/success', authHelper.authChecker, async (req, res) => {
 		return res.redirect(`/firstLogin?redirect=${redirectUrl}`);
 	}
 
-	// if this happens: SSO
-	const {
-		accountId,
-		systemId,
-		schoolId,
-	} = res.locals.currentPayload || {};
-	if (accountId && systemId && schoolId) {
-		const schools = await LoginSchoolsCache.get(req);
-		if (schools.length > 0) {
-			const checkSchool = schools.find((school) => school._id === schoolId);
-			if (checkSchool && checkSchool.systems) {
-				const schoolWithSystem = checkSchool.systems.find(
-					(system) => system._id === systemId,
-				);
-				if (schoolWithSystem) {
-					res.redirect(`/registration/${schoolId}/sso/${accountId}`);
-				}
-			}
-		}
-	}
-
 	const redirectUrl = determineRedirectUrl(req);
 	res.redirect(redirectUrl);
 
diff --git a/controllers/registration.js b/controllers/registration.js
index 0a7c8dc34e..e57af5d197 100644
--- a/controllers/registration.js
+++ b/controllers/registration.js
@@ -12,8 +12,6 @@ const { getCurrentLanguage } = require('../helpers/i18n');
 const { setCookie } = require('../helpers/cookieHelper');
 const { logger, formatError } = require('../helpers');
 
-const { LoginSchoolsCache } = require('../helpers/cache');
-
 let invalid = false;
 const isProduction = NODE_ENV === 'production';
 
@@ -192,12 +190,9 @@ router.post(
 );
 
 const schoolExists = async (req, schoolId) => {
-	const schools = await LoginSchoolsCache.get(req);
-	if (schools.length > 0) {
-		const checkSchool = schools.find((school) => school._id === schoolId);
-		return checkSchool !== undefined;
-	}
-	return false;
+	const res = await api(req, { version: 'v3' }).get(`/school/exists/id/${schoolId}`);
+
+	return res.exists;
 };
 
 router.get(['/registration/:classOrSchoolId/byparent', '/registration/:classOrSchoolId/byparent/:sso/:accountId'],
diff --git a/helpers/cache/schools.js b/helpers/cache/schools.js
index 1dc9720d7f..f3e74a11c9 100644
--- a/helpers/cache/schools.js
+++ b/helpers/cache/schools.js
@@ -5,7 +5,7 @@ const { logger, formatError } = require('..');
 const getLoginSchools = async (req) => {
 	let schools = [];
 	try {
-		schools = await api(req).get('/schoolsList');
+		schools = await api(req, { version: 'v3' }).get('/school/list-for-ldap-login');
 	} catch (err) {
 		logger.error('error getting schools', formatError(err));
 	}
diff --git a/static/scripts/login.js b/static/scripts/login.js
index 1c49e4c6fe..b7aa68ce0b 100644
--- a/static/scripts/login.js
+++ b/static/scripts/login.js
@@ -93,23 +93,21 @@ $(document).ready(() => {
 		incTimer();
 	}
 
-	const loadSystems = (systems) => {
+	const setSystemOptions = (systems) => {
 		$systems.empty();
 
-		const ldapSystems = systems.filter((system) => system.type === 'ldap');
-
-		ldapSystems.forEach((system) => {
+		systems.forEach((system) => {
 			const systemAlias = system.alias ? ` (${system.alias})` : '';
 			let selected = false;
-			if (storage.local.getItem('loginSystem') === system._id) {
+			if (storage.local.getItem('loginSystem') === `${system.id}//${system.type}`) {
 				selected = true;
 			}
 			// eslint-disable-next-line max-len
-			$systems.append(`<option ${selected ? 'selected' : ''} value="${system._id}//${system.type}">${system.type}${systemAlias}</option>`);
+			$systems.append(`<option ${selected ? 'selected' : ''} value="${system.id}//${system.type}">${system.type}${systemAlias}</option>`);
 		});
 
 		// eslint-disable-next-line no-unused-expressions
-		ldapSystems.length < 2 ? $systems.parent().hide() : $systems.parent().show();
+		systems.length < 2 ? $systems.parent().hide() : $systems.parent().show();
 
 		$systems.trigger('chosen:updated');
 	};
@@ -223,7 +221,7 @@ $(document).ready(() => {
 		enableDisableLdapBtn(id);
 		const dataSystems = $(event.target).find(':selected').data('systems');
 		if (id !== '' && dataSystems) {
-			loadSystems(dataSystems);
+			setSystemOptions(dataSystems);
 		} else {
 			$systems.parent().hide();
 		}
diff --git a/views/authentication/forms/login.hbs b/views/authentication/forms/login.hbs
index 4fe39fcf90..cdb8a91d5e 100644
--- a/views/authentication/forms/login.hbs
+++ b/views/authentication/forms/login.hbs
@@ -47,7 +47,7 @@
                         <select id="school" name="schoolId" class="school search-enabled" data-placeholder="{{$t "login.input.school"}}">
                                 <option selected value="">{{$t "login.input.noSchoolsSelection"}}</option>
                             {{#each schools}}
-                                <option value="{{this._id}}" data-systems='{{{json this.systems}}}'>{{this.name}}</option>
+                                <option value="{{this.id}}" data-systems='{{{json this.systems}}}'>{{this.name}}</option>
                             {{else}}
                                 <option disabled>{{$t "login.input.noSchoolsAvailable"}}</option>
                             {{/each}}
@@ -57,7 +57,7 @@
                         <label for="system">{{$t "login.label.system"}}</label>
                         <select id="system" name="system" class="system" data-placeholder="{{$t "login.input.system"}}">
                             {{#each systems}}
-                                <option value="{{this._id}}//{{this.type}}">{{this.type}}{{#if this.alias}}({{this.alias}}){{/if}}</option>
+                                <option value="{{this.id}}//{{this.type}}">{{this.type}}{{#if this.alias}}({{this.alias}}){{/if}}</option>
                             {{else}}
                                 <option selected disabled>{{$t "login.input.noSystemsAvailable"}}</option>
                             {{/each}}
@@ -204,7 +204,7 @@
                             <select id="school" name="schoolId" class="school search-enabled" data-placeholder="{{$t "login.input.school"}}">
                                     <option selected value="">{{$t "login.input.noSchoolsSelection"}}</option>
                                 {{#each schools}}
-                                    <option value="{{this._id}}" data-systems='{{{json this.systems}}}'>{{this.name}}</option>
+                                    <option value="{{this.id}}" data-systems='{{{json this.systems}}}'>{{this.name}}</option>
                                 {{else}}
                                     <option disabled>{{$t "login.input.noSchoolsAvailable"}}</option>
                                 {{/each}}
@@ -214,7 +214,7 @@
                             <div class="system-display">
                                 <select id="system" name="system" class="system" data-placeholder="{{$t "login.input.system"}}">
                                     {{#each systems}}
-                                        <option value="{{this._id}}//{{this.type}}">{{this.type}}{{#if this.alias}}({{this.alias}}){{/if}}</option>
+                                        <option value="{{this.id}}//{{this.type}}">{{this.type}}{{#if this.alias}}({{this.alias}}){{/if}}</option>
                                     {{else}}
                                         <option selected disabled>{{$t "login.input.noSystemsAvailable"}}</option>
                                     {{/each}}