diff --git a/forge/ee/lib/sso/index.js b/forge/ee/lib/sso/index.js
index bbb8d38b1f..bea0ff1ac1 100644
--- a/forge/ee/lib/sso/index.js
+++ b/forge/ee/lib/sso/index.js
@@ -454,6 +454,11 @@ module.exports.init = async function (app) {
         // This is an array of groups the user belongs to. We expect them to be
         // of the form 'ff-SLUG-ROLE' - anything else is ignored
         let groupAssertions = samlUser[providerOpts.groupAssertionName]
+        if (!groupAssertions && providerOpts.groupOtherTeams) {
+            // Some IdPs (e.g. Azure) omit the claim when the user is in no groups
+            app.log.info(`SAML response missing ${providerOpts.groupAssertionName} assertion for ${user.username}, treating as no groups`)
+            groupAssertions = []
+        }
         if (groupAssertions) {
             const promises = []
             if (!Array.isArray(groupAssertions)) {
diff --git a/test/unit/forge/ee/lib/sso/index_spec.js b/test/unit/forge/ee/lib/sso/index_spec.js
index 90777bd491..6a91df7009 100644
--- a/test/unit/forge/ee/lib/sso/index_spec.js
+++ b/test/unit/forge/ee/lib/sso/index_spec.js
@@ -291,6 +291,37 @@ NOY6Z1oJnpttQ9gwyV8euQ3C0Wcjf3+OVQ==
             })
         })
 
+        it('treats missing group assertions as no groups when other teams are allowed', async function () {
+            // An IdP can omit the claim when the user is in no groups (seen with Azure)
+            await app.sso.updateTeamMembership({}, app.user, {
+                groupAssertionName: 'ff-roles',
+                groupTeams: ['ateam', 'bteam'],
+                groupOtherTeams: true
+            })
+            should.not.exist(await app.db.models.TeamMember.getTeamMembership(app.user.id, teams.ATeam.id))
+            should.not.exist(await app.db.models.TeamMember.getTeamMembership(app.user.id, teams.BTeam.id))
+            ;(await app.db.models.TeamMember.getTeamMembership(app.user.id, teams.DTeam.id)).should.have.property('role', Roles.Viewer)
+        })
+
+        it('removes admin when group assertions are missing and groupAdmin is set', async function () {
+            // a second admin, so Alice is not the last one
+            const otherAdmin = await app.factory.createUser({ admin: true, username: 'sso-admin2', name: 'Other Admin', email: 'sso-admin2@example.com', password: 'ccPassword' })
+            try {
+                await app.sso.updateTeamMembership({}, app.user, {
+                    groupAssertionName: 'ff-roles',
+                    groupTeams: ['ateam', 'bteam'],
+                    groupOtherTeams: true,
+                    groupAdmin: true,
+                    groupAdminName: 'ff-admins'
+                })
+                ;(await app.db.models.User.byId(app.user.id)).should.have.property('admin', false)
+            } finally {
+                app.user.admin = true
+                await app.user.save()
+                await otherAdmin.destroy()
+            }
+        })
+
         it('applies team membership changes - all teams', async function () {
             // Apply changes to all teams
             // Covers: