Hello Federico Coppola,
Thanks for your question.
By default temporary passwords are not synchronized to Entra ID.
To support temporary passwords in Microsoft Entra ID for synchronized users, you can enable the ForcePasswordChangeOnLogOn feature. See:
If a user was created in Active Directory with "User must change password at next logon" before the feature was enabled, the user will receive an error while signing in. To remediate this issue, un-check and re-check the field "User must change password at next logon" in Active Directory Users and Computers. After synchronizing the user object changes, the user will receive the expected prompt in Microsoft Entra ID to update their password.
You should only use this feature when SSPR and Password Writeback are enabled on the tenant. This is so that if a user changes their password via SSPR, it will be synchronized to Active Directory.
The above are excerpts from the doc above.
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola