Hi @luigire,
Than you for posting your question.
While we have not conducted a formal compatibility check with WPML, we have not received any user reports indicating compatibility issues either.
If you encounter any issues, we kindly ask you to submit a support ticket directly from your Sendcloud account. Our support team is available to provide assistance in case you encounter any issues.
More information here:
https://support.sendcloud.com/hc/en-us/articles/360025145011-How-do-I-create-a-support-ticket
Best regards,
Edson | Sendcloud