diff --git a/apps/meteor/client/views/omnichannel/departments/DepartmentAgentsTable/AgentRow.tsx b/apps/meteor/client/views/omnichannel/departments/DepartmentAgentsTable/AgentRow.tsx
index e732a84b0e80d..d93b9800e3f52 100644
--- a/apps/meteor/client/views/omnichannel/departments/DepartmentAgentsTable/AgentRow.tsx
+++ b/apps/meteor/client/views/omnichannel/departments/DepartmentAgentsTable/AgentRow.tsx
@@ -24,10 +24,10 @@ const AgentRow = ({ index, agent, register, onRemove }: AgentRowProps) => {
 				<AgentAvatar name={agent.name || ''} username={agent.username || ''} />
 			</GenericTableCell>
 			<GenericTableCell fontScale='p2' color='hint' withTruncatedText>
-				<NumberInput title={t('Count')} maxWidth='100%' {...register(`agentList.${index}.count`, { valueAsNumber: true })} />
+				<NumberInput title={t('Count')} maxWidth='100%' {...register(`agentList.${index}.count`, { valueAsNumber: true, min: 0 })} />
 			</GenericTableCell>
 			<GenericTableCell fontScale='p2' color='hint' withTruncatedText>
-				<NumberInput title={t('Order')} maxWidth='100%' {...register(`agentList.${index}.order`, { valueAsNumber: true })} />
+				<NumberInput title={t('Order')} maxWidth='100%' {...register(`agentList.${index}.order`, { valueAsNumber: true, min: 0 })} />
 			</GenericTableCell>
 			<GenericTableCell fontScale='p2' color='hint'>
 				<RemoveAgentButton agentId={agent.agentId} onRemove={onRemove} />
@@ -35,4 +35,5 @@ const AgentRow = ({ index, agent, register, onRemove }: AgentRowProps) => {
 		</GenericTableRow>
 	);
 };
+
 export default memo(AgentRow);
diff --git a/apps/meteor/tests/end-to-end/api/livechat/10-departments.ts b/apps/meteor/tests/end-to-end/api/livechat/10-departments.ts
index 4e65439fb762c..34ee3ce32b4de 100644
--- a/apps/meteor/tests/end-to-end/api/livechat/10-departments.ts
+++ b/apps/meteor/tests/end-to-end/api/livechat/10-departments.ts
@@ -915,6 +915,7 @@ import { IS_EE } from '../../../e2e/config/constants';
 				.expect(200);
 			expect(res.body).to.have.property('success', true);
 		});
+
 		it('should successfully remove an agent from a department', async () => {
 			const [dep, agent] = await Promise.all([createDepartment(), createAgent()]);
 			const res = await request
@@ -940,6 +941,50 @@ import { IS_EE } from '../../../e2e/config/constants';
 			expect(res.body).to.have.property('success', true);
 			await deleteDepartment(dep._id);
 		});
+
+		describe('count and order validation', () => {
+			let dep: ILivechatDepartment;
+			let agent: IUser;
+
+			before(async () => {
+				await updatePermission('manage-livechat-departments', ['admin']);
+				await updatePermission('add-livechat-department-agents', ['admin', 'livechat-manager']);
+				[dep, agent] = await Promise.all([createDepartment(), createAgent()]);
+			});
+
+			after(async () => {
+				await deleteDepartment(dep._id);
+			});
+
+			it('should fail if count is negative', async () => {
+				const res = await request
+					.post(api(`livechat/department/${dep._id}/agents`))
+					.set(credentials)
+					.send({ upsert: [{ agentId: agent._id, username: agent.username, count: -1, order: 0 }], remove: [] })
+					.expect(400);
+				expect(res.body).to.have.property('success', false);
+				expect(res.body.error).to.include('must be >= 0');
+			});
+
+			it('should fail if order is negative', async () => {
+				const res = await request
+					.post(api(`livechat/department/${dep._id}/agents`))
+					.set(credentials)
+					.send({ upsert: [{ agentId: agent._id, username: agent.username, count: 0, order: -1 }], remove: [] })
+					.expect(400);
+				expect(res.body).to.have.property('success', false);
+				expect(res.body.error).to.include('must be >= 0');
+			});
+
+			it('should successfully add an agent when count and order are 0', async () => {
+				const res = await request
+					.post(api(`livechat/department/${dep._id}/agents`))
+					.set(credentials)
+					.send({ upsert: [{ agentId: agent._id, username: agent.username, count: 0, order: 0 }], remove: [] })
+					.expect(200);
+				expect(res.body).to.have.property('success', true);
+			});
+		});
 	});
 
 	describe('Department archivation', () => {
diff --git a/packages/rest-typings/src/v1/omnichannel.ts b/packages/rest-typings/src/v1/omnichannel.ts
index fe5988d3583c1..ab71119954dbc 100644
--- a/packages/rest-typings/src/v1/omnichannel.ts
+++ b/packages/rest-typings/src/v1/omnichannel.ts
@@ -186,9 +186,11 @@ const LivechatDepartmentDepartmentIdAgentsPOSTSchema = {
 					name: { type: 'string' },
 					count: {
 						type: 'number',
+						minimum: 0,
 					},
 					order: {
 						type: 'number',
+						minimum: 0,
 					},
 				},
 				required: ['agentId', 'username'],
@@ -211,9 +213,11 @@ const LivechatDepartmentDepartmentIdAgentsPOSTSchema = {
 					},
 					count: {
 						type: 'number',
+						minimum: 0,
 					},
 					order: {
 						type: 'number',
+						minimum: 0,
 					},
 					departmentEnabled: { type: 'boolean' },
 					departmentId: { type: 'string' },
@@ -826,10 +830,12 @@ const POSTLivechatDepartmentSchema = {
 					},
 					count: {
 						type: 'number',
+						minimum: 0,
 						nullable: true,
 					},
 					order: {
 						type: 'number',
+						minimum: 0,
 						nullable: true,
 					},
 				},