ERROR: service.FAILURE (system failure: POST failed, status=500 500)

Good day everyone, I am having some difficulties during the migration from my Zimbra OSE server to the Carbonio CE.

Mailbox migrated ok, no problem, now that I am trying to import the data of the mailboxes I received the error "ERROR: service.FAILURE (system failure: POST failed, status=500 500)"

I tried these steps and command:

zmmailbox -v -z -m user@domain postRestURL '//?fmt=tgz&resolve=skip' mbox/user@domain.tgz ;

zmmailbox -v -z -m user@domain -t 0 postRestURL -u https://server_url '//?fmt=tgz&resolve=skip' mbox/user@domain.tgz ;

zmmailbox -v -z -m user@domain -t 0 postRestURL -u https://IP '//?fmt=tgz&resolve=skip' mbox/user@domain.tgz ;

These information I tried also on the GUI although aside the port 443 the hostname and the protocol https were configured also before the data import, anyhow:

zmprov md domain zimbraPublicServicePort 443

zmprov md dominio zimbraPublicServiceProtocol https

zmprov mcf zimbraPublicServiceHostname FQDN

The verbose output

ERROR: service.FAILURE (system failure: POST failed, status=500 500)

com.zimbra.common.service.ServiceException: system failure: POST failed, status=500 500

ExceptionId:main:1702114743555:a4f481d3a63fa9aa

Code:service.FAILURE

at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:303)

at com.zimbra.client.ZMailbox.postRESTResource(ZMailbox.java:3881)

at com.zimbra.cs.zclient.ZMailboxUtil.doPostRestURL(ZMailboxUtil.java:3846)

at com.zimbra.cs.zclient.ZMailboxUtil.execute(ZMailboxUtil.java:1998)

at com.zimbra.cs.zclient.ZMailboxUtil.main(ZMailboxUtil.java:3711)

Something that I noticed running the command of import with the debug mode, before the error above, it shows the server admin url with the port 9071 although this port is not running on the server

   <dataSources/>

      <soapURL> https://FQDN/service/soap/</soapURL>

      <publicURL> https://FQDN</publicURL>

      <adminURL> https://FQDN:9071/carbonioAdmin</adminURL>

      <pasteitcleanedEnabled>0</pasteitcleanedEnabled>

    </GetInfoResponse>

  </soap:Body>

</soap:Envelope>

Any Ideas of how to solve this?

Thank you