"Specified request cannot be processed." when making any async/bulk REST API call in Magento 2

Question

I have Magento Open Source 2.4.0 with PHP 7.4 and RabbitMQ 3.8 set up in app/etc/env.php:

'queue' => [
    'consumers_wait_for_messages' => 0,
    'amqp' => [
        'host' => '127.0.0.1',
        'port' => '5672',
        'user' => 'magento',
        'password' => 'secret',
        'virtualhost' => '/'
    ]
],

I ran setup:upgrade multiple times since adding this configuration. I have all queues except async.operations.all:

$ php7.4 bin/magento queue:consumers:list
product_action_attribute.update
product_action_attribute.website.update
exportProcessor
inventory.source.items.cleanup
inventory.mass.update
inventory.reservations.cleanup
inventory.reservations.update
media.storage.catalog.image.resize
codegeneratorProcessor
inventory.reservations.updateSalabilityStatus
inventory.indexer.sourceItem
inventory.indexer.stock
media.content.synchronization
media.gallery.synchronization

In another Magento installation, that async.operations.all queue appeared the first time I created a bulk request, so I’m not worried here.

I’m making a PUT /rest/es/async/bulk/V1/products/bySku (es is my store code) with the following JSON payload:

[{"product": {"sku": "some_sku_here", "name": "new name"}}]

I get a 400 with "No se puede procesar la petición especificada.", which is Spanish for "Specified request cannot be processed.".

Whatever the JSON body I use, I always get this error. I have no issue on the non-async/bulk endpoints (for example /rest/es/V1/product/some_sku_here).

I’ve checked RabbitMQ credentials but they’re correct. I can connect using the credentials and host/port above. I’ve not found anything on the Internet that matches my issue.

Any idea?

Answer 1

After one day of searching the Internet, I finally found the answer 6 minutes after asking this question:

This is what I had in app/etc/config.php:

    'Magento_WebapiAsync' => 0,

Enabling the module with bin/magento module:enable Magento_WebapiAsync then setup:upgrade/setup:di:compile fixed my issue.