Update the responsible user for the universal activity crm.activity.todo.updateResponsibleUser

curl -X POST \
        -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -d '{"id":999,"ownerTypeId":2,"ownerId":1,"responsibleId":5,"auth":"**put_access_token_here**"}' \
        https://**put_your_bitrix24_address**/rest/crm.activity.todo.updateResponsibleUser
        

// This snippet is an ES module: top-level await requires type="module" or a bundler.
        // $b24 is an already-initialized SDK instance (see the SDK "Get started" guide).
        import { Text } from '@bitrix24/b24jssdk'
        import type { B24Frame } from '@bitrix24/b24jssdk'
        
        declare const $b24: B24Frame
        
        // Shape of the payload returned in result (match the "response handling" section of the page)
        type UpdateResponsibleUserResult = {
          id: number
        }
        
        try {
          const response = await $b24.actions.v2.call.make<UpdateResponsibleUserResult>({
            method: 'crm.activity.todo.updateResponsibleUser',
            params: {
              id: 999,
              ownerTypeId: 2,
              ownerId: 1,
              responsibleId: 5,
            },
            requestId: Text.getUuidRfc4122()
          })
        
          // The payload is available only on a successful response
          if (!response.isSuccess) {
            console.error(response.getErrorMessages().join('; '))
          } else {
            const result = response.getData()!.result
            console.info('Updated activity ID:', result.id)
          }
        } catch (error) {
          // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
          console.error(error)
        }
        

<!-- Load the SDK (UMD build); it is exposed as the global B24Js -->
        <script src="https://unpkg.com/@bitrix24/b24jssdk@1/dist/umd/index.min.js"></script>
        <script>
          async function updateResponsibleUser() {
            try {
              // Initialize the SDK inside a Bitrix24 frame
              const $b24 = await B24Js.initializeB24Frame()
        
              const response = await $b24.actions.v2.call.make({
                method: 'crm.activity.todo.updateResponsibleUser',
                params: {
                  id: 999,
                  ownerTypeId: 2,
                  ownerId: 1,
                  responsibleId: 5,
                },
                requestId: B24Js.Text.getUuidRfc4122()
              })
        
              // The payload is available only on a successful response
              if (!response.isSuccess) {
                console.error(response.getErrorMessages().join('; '))
                return
              }
        
              const result = response.getData().result
              console.info('Updated activity ID:', result.id)
            } catch (error) {
              // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
              console.error(error)
            }
          }
        
          document.addEventListener('DOMContentLoaded', updateResponsibleUser)
        </script>
        

        from b24pysdk.errors import BitrixAPIError, BitrixSDKException
        
        try:
            bitrix_response = client.crm.activity.todo.update_responsible_user(
                bitrix_id=999,
                owner_type_id=2,
                owner_id=101,
                responsible_id=1,
            ).response
            result = bitrix_response.result
            print(result)
        except BitrixAPIError as error:
            print(
                "Bitrix API error",
                f"error: {error.error}",
                f"error_description: {error.error_description}",
                sep="\n",
            )
        except BitrixSDKException as error:
            print(f"Bitrix SDK error: {error.message}")
        except Exception as error:
            print(f"Unexpected error: {error}")
        

try {
            $response = $b24Service
                ->core
                ->call(
                    'crm.activity.todo.updateResponsibleUser',
                    [
                        'id'           => 999,
                        'ownerTypeId'  => 2,
                        'ownerId'      => 1,
                        'responsibleId' => 5
                    ]
                );
        
            $result = $response
                ->getResponseData()
                ->getResult();
        
            if ($result->error()) {
                error_log($result->error());
            } else {
                echo 'Success: ' . print_r($result->data(), true);
            }
        
        } catch (Throwable $e) {
            error_log($e->getMessage());
            echo 'Error updating responsible user: ' . $e->getMessage();
        }
        

BX24.callMethod(
            "crm.activity.todo.updateResponsibleUser",
            {
                id: 999,
                ownerTypeId: 2,
                ownerId: 1,
                responsibleId: 5
            }, 
            result => {
                if (result.error())
                    console.error(result.error());
                else
                    console.dir(result.data());
            }
        );
        

require_once('crest.php');
        
        $result = CRest::call(
            'crm.activity.todo.updateResponsibleUser',
            [
                'id' => 999,
                'ownerTypeId' => 2,
                'ownerId' => 1,
                'responsibleId' => 5
            ]
        );
        
        echo '<PRE>';
        print_r($result);
        echo '</PRE>';
        

// client and ctx are already created — see the Go SDK section
        res, err := client.Core().Call(ctx, "crm.activity.todo.updateResponsibleUser", b24.Params{
        	"id":            999,
        	"ownerTypeId":   2,
        	"ownerId":       1,
        	"responsibleId": 5,
        })
        if err != nil {
        	return fmt.Errorf("crm.activity.todo.updateResponsibleUser: %w", err)
        }
        
        var item struct {
        	ID b24.ID `json:"id"`
        }
        if err := json.Unmarshal(res.Result, &item); err != nil {
        	return fmt.Errorf("parse response: %w", err)
        }
        fmt.Println(item.ID)