diff --git a/dictation_server/src/api/odms/openapi.json b/dictation_server/src/api/odms/openapi.json
index 0dd1122..81aebc6 100644
--- a/dictation_server/src/api/odms/openapi.json
+++ b/dictation_server/src/api/odms/openapi.json
@@ -1984,8 +1984,8 @@
         "properties": {
           "name": { "type": "string" },
           "role": { "type": "string", "description": "none/author/typist" },
-          "authorId": { "type": "string", "nullable": true },
-          "typistGroupName": { "type": "string", "nullable": true },
+          "authorId": { "type": "string" },
+          "typistGroupName": { "type": "array", "items": { "type": "string" } },
           "email": { "type": "string" },
           "emailVerified": { "type": "boolean" },
           "autoRenew": { "type": "boolean" },
@@ -1993,8 +1993,8 @@
           "notification": { "type": "boolean" },
           "encryption": { "type": "boolean" },
           "prompt": { "type": "boolean" },
-          "expiration": { "type": "string", "nullable": true },
-          "remaining": { "type": "number", "nullable": true },
+          "expiration": { "type": "string" },
+          "remaining": { "type": "number" },
           "licenseStatus": {
             "type": "string",
             "description": "Normal/NoLicense/Alert/Renew"
@@ -2003,7 +2003,6 @@
         "required": [
           "name",
           "role",
-          "authorId",
           "typistGroupName",
           "email",
           "emailVerified",
@@ -2012,8 +2011,6 @@
           "notification",
           "encryption",
           "prompt",
-          "expiration",
-          "remaining",
           "licenseStatus"
         ]
       },
diff --git a/dictation_server/src/features/users/types/types.ts b/dictation_server/src/features/users/types/types.ts
index 515336d..c789013 100644
--- a/dictation_server/src/features/users/types/types.ts
+++ b/dictation_server/src/features/users/types/types.ts
@@ -20,11 +20,11 @@ export class User {
   @ApiProperty({ description: 'none/author/typist' })
   role: string;
 
-  @ApiProperty({ nullable: true })
+  @ApiProperty({ required: false })
   authorId?: string | undefined;
 
-  @ApiProperty({ nullable: true })
-  typistGroupName?: string | undefined;
+  @ApiProperty()
+  typistGroupName: string[];
 
   @ApiProperty()
   email: string;
@@ -47,10 +47,10 @@ export class User {
   @ApiProperty()
   prompt: boolean;
 
-  @ApiProperty({ nullable: true })
+  @ApiProperty({ required: false })
   expiration?: string | undefined;
 
-  @ApiProperty({ nullable: true })
+  @ApiProperty({ required: false })
   remaining?: number | undefined;
 
   @ApiProperty({
diff --git a/dictation_server/src/features/users/users.service.spec.ts b/dictation_server/src/features/users/users.service.spec.ts
index 9781663..252effc 100644
--- a/dictation_server/src/features/users/users.service.spec.ts
+++ b/dictation_server/src/features/users/users.service.spec.ts
@@ -580,7 +580,7 @@ const expectedUsers = [
     name: 'Hanako Sato',
     role: 'none',
     authorId: '6cce347f-0cf1-a15e-19ab-d00988b643f9',
-    typistGroupName: '',
+    typistGroupName: [''],
     email: 'hanako@sample.com',
     emailVerified: true,
     autoRenew: false,
@@ -594,7 +594,7 @@ const expectedUsers = [
     name: 'Hanako Sato',
     role: 'none',
     authorId: '551c4077-5b55-a38c-2c55-cd1edd537aa8',
-    typistGroupName: '',
+    typistGroupName: [''],
     email: 'hanako@sample.com',
     emailVerified: true,
     autoRenew: false,
diff --git a/dictation_server/src/features/users/users.service.ts b/dictation_server/src/features/users/users.service.ts
index 767bb65..9a157b2 100644
--- a/dictation_server/src/features/users/users.service.ts
+++ b/dictation_server/src/features/users/users.service.ts
@@ -316,7 +316,7 @@ export class UsersService {
         user.role = dbUsers[i].role;
         user.authorId = dbUsers[i].author_id;
         // TODO [Task2247] 将来的にはDBから取得できるようになる想定のため暫定的にtypistGroupNameに仮の値を設定
-        user.typistGroupName = '';
+        user.typistGroupName = [''];
         user.email = aadb2cUser.mail;
         user.emailVerified = dbUsers[i].email_verified;
         user.autoRenew = dbUsers[i].auto_renew;