@Lopez Alonso, Luis Unfortunately, you cannot call HTTP requests having self signed certificate as mentioned here for the multi-tenant Azure Logic Apps environment i.e. Consumption SKU.
For logic apps in the global, multi-tenant Azure Logic Apps environment, HTTP operations don't permit self-signed TLS/SSL certificates. If your logic app makes an HTTP call to a server and presents a TLS/SSL self-signed certificate, the HTTP call fails with a TrustFailure error.