To ensure that the WHMautic module can update the WHMCS client informations you must enable this fields to be publicly editable on Mautic:
To turn the fields publicly updatable, open the right menu and click on Custom Fields option.
Search for the respective field and click on them to open the configuration options.
When you turn to yes the Email field publicly updatable, you permit that this field can be updatable from the tracking gif of mautic Tracking Code inserted on your WHMCS pages from the module WHMautic. These are necessary to module track when a client log in into your WHMCS.
Change the Publicly updatable to on and save the change.
Repeat this step for each field required.
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