diff --git a/changelogs/fragments/group-support-long-group-names.yml b/changelogs/fragments/group-support-long-group-names.yml
new file mode 100644
index 0000000..7c55789
--- /dev/null
+++ b/changelogs/fragments/group-support-long-group-names.yml
@@ -0,0 +1,2 @@
+bugfixes:
+- microsoft.ad.group - Support membership lookup of groups that are longer than 20 characters long
diff --git a/plugins/module_utils/_ADObject.psm1 b/plugins/module_utils/_ADObject.psm1
index a075487..e51c974 100644
--- a/plugins/module_utils/_ADObject.psm1
+++ b/plugins/module_utils/_ADObject.psm1
@@ -559,9 +559,6 @@ Function Get-AnsibleADObject {
     elseif ($Identity -match '^.*\@.*\..*$') {
         $getParams.LDAPFilter = "(userPrincipalName=$($Matches[0]))"
     }
-    elseif ($Identity -match '^(?:[^:*?""<>|\/\\]+\\)?(?<username>[^;:""<>|?,=\*\+\\\(\)]{1,20})$') {
-        $getParams.LDAPFilter = "(sAMAccountName=$($Matches.username))"
-    }
     else {
         try {
             $sid = New-Object -TypeName System.Security.Principal.SecurityIdentifier -ArgumentList $Identity
@@ -574,8 +571,13 @@ Function Get-AnsibleADObject {
             $getParams.LDAPFilter = "(objectSid=$value)"
         }
         catch [System.ArgumentException] {
-            # Finally fallback to DistinguishedName.
-            $getParams.Identity = $Identity
+            if ($Identity -match '^(?:[^:*?""<>|\/\\]+\\)?(?<username>[^;:""<>|?,=\*\+\\\(\)]+)$') {
+                $getParams.LDAPFilter = "(sAMAccountName=$($Matches.username))"
+            }
+            else {
+                # Finally fallback to DistinguishedName.
+                $getParams.Identity = $Identity
+            }
         }
     }
 
diff --git a/tests/integration/targets/group/tasks/tests.yml b/tests/integration/targets/group/tasks/tests.yml
index bdb1b95..b40041b 100644
--- a/tests/integration/targets/group/tasks/tests.yml
+++ b/tests/integration/targets/group/tasks/tests.yml
@@ -88,6 +88,14 @@
     - 3
     - 4
 
+  - name: create test group with long name
+    group:
+      name: MyGroup2-ReallyLongGroupNameHere
+      state: present
+      scope: global
+      path: '{{ ou_info.distinguished_name }}'
+    register: test_group
+
   - name: fail to find members to add to a group
     group:
       name: MyGroup
@@ -109,6 +117,7 @@
         add:
         - my_user_1
         - '{{ test_users.results[2].sid }}'
+        - MyGroup2-ReallyLongGroupNameHere
     register: add_member_check
     check_mode: true
 
@@ -133,6 +142,7 @@
         add:
         - my_user_1
         - '{{ test_users.results[2].sid }}'
+        - MyGroup2-ReallyLongGroupNameHere
     register: add_member
 
   - name: get result of add members to a group
@@ -146,9 +156,10 @@
     assert:
       that:
       - add_member is changed
-      - add_member_actual.objects[0].member | length == 2
+      - add_member_actual.objects[0].member | length == 3
       - test_users.results[0].distinguished_name in add_member_actual.objects[0].member
       - test_users.results[2].distinguished_name in add_member_actual.objects[0].member
+      - test_group.distinguished_name in add_member_actual.objects[0].member
 
   - name: add members to a group - idempotent
     group:
@@ -158,6 +169,7 @@
         add:
         - user_1@{{ domain_realm }}
         - '{{ test_users.results[2].object_guid }}'
+        - MyGroup2-ReallyLongGroupNameHere
     register: add_member_again
 
   - name: assert add members to a group - idempotent
@@ -186,7 +198,8 @@
     assert:
       that:
       - remove_member is changed
-      - remove_member_actual.objects[0].member == test_users.results[2].distinguished_name
+      - test_users.results[2].distinguished_name in remove_member_actual.objects[0].member
+      - test_group.distinguished_name in remove_member_actual.objects[0].member
 
   - name: remove member from a group - idempotent
     group:
@@ -226,9 +239,10 @@
     assert:
       that:
       - add_remove_member is changed
-      - add_remove_member_actual.objects[0].member | length == 2
+      - add_remove_member_actual.objects[0].member | length == 3
       - test_users.results[0].distinguished_name in add_remove_member_actual.objects[0].member
       - test_users.results[1].distinguished_name in add_remove_member_actual.objects[0].member
+      - test_group.distinguished_name in add_remove_member_actual.objects[0].member
 
   - name: set members
     group: