Before you map the field, you must create it in Account Engagement .
If the field is already mapped, it will not appear in the dropdown .
Field names are not “case sensitive” . That is, they do not discriminate between upper and lower case.
To map a field that is in Lead and Contact with one in MCAE, both singapore whatsapp number must be named exactly the same . We refer to the internal name of the field or also called API Name.
MCAE fields cannot be synced with Salesforce fields of the following types: lookup and geolocation .
Salesforce phone fields must be synced with text fields in MCAE/Pardot . Do not do this with a numeric field, because in many areas, these fields sometimes have non-numeric characters.
The steps to map a field :
In Marketing Cloud Account Engagement – Pardot open or create the custom field.
Give the field a name .

Optional (you can modify the ID that is automatically created and also add tags).
In the Salesforce Fields dropdown , choose the field you want to map (remember that if you want to map to Lead and Contact they must have the same API name.
Created Custom Field Pardot
To sync changes made in Salesforce to a given field , choose “Keep this field's type and possible values (for dropdowns, radio buttons, checkboxes)” synced with Salesforce CRM.
You can choose 3 sync options : Salesforce value prevails, MCAE/Pardot value prevails, or the most recent of both must be used.
Finally, you choose the rest of the options and, if you want to use SF's pre-defined values, check "Use pre-defined values.
And follow this same process as many times as fields you need to create.
If you need more information about this process, you can find the official Salesforce help information here :