Ubuntu Desktop 20.04 - Authenticate to multiple Active Directory domains of the same forrest

There is an Active Directory forrest made up of 4 domains, a root domain root.local and 3 child domains called resource (resource.root.local), companyA (companyA.root.local) and companyB (companyB.root.local).

The machine is joined to the resource domain and we can successfully logon to the machine using an account of the same machine. The authentication with accounts of the companyA and B domains are not working.

We have added the domains in the krb5.conf:

[libdefaults]
    default_realm = RESOURCE.ROOT.LOCAL
    dns_lookup_kdc = true
    udp_preference_limit = 10

[realms]
    RESOURCE.ROOT.LOCAL = {
    kdc = RESOURCE.ROOT.LOCAL
    admin_server = RESOURCE.ROOT.LOCAL
    }
 
    COMPANYA.ROOT.LOCAL = {
    kdc = COMPANYA.ROOT.LOCAL
    admin_server = COMPANYA.ROOT.LOCAL
    }
    
    COMPANYB.ROOT.LOCAL = {
    kdc = COMPANYB.ROOT.LOCAL
    admin_server = COMPANYB.ROOT.LOCAL
    }

[domain_realm]
    RESOURCE.ROOT.LOCAL = RESOURCE.ROOT.LOCAL
    .RESOURCE.ROOT.LOCAL = RESOURCE.ROOT.LOCAL
    COMPANYA.ROOT.LOCAL = COMPANYA.ROOT.LOCAL
    .COMPANYA.ROOT.LOCAL = COMPANYA.ROOT.LOCAL
    COMPANYB.ROOT.LOCAL = COMPANYB.ROOT.LOCAL
    .COMPANYB.ROOT.LOCAL = COMPANYB.ROOT.LOCAL

smb.conf:

[global]
    security = ADS
    realm = RESOURCE.ROOT.LOCAL
    workgroup = RESOURCE
    encrypt passwords = yes
    idmap config *:range = 16777216-33554431
    winbind trusted domains only = no
    winbind use default domain = no
    kerberos method = secrets and keytab
    winbind refresh tickets = yes
    template shell = /bin/bash

What can i do to achieve this or how can I troubleshoot?

Thanks