Add Contact to Account
Associate an existing contact with an existing account in Dynamics 365. Sets the contact's parent customer to this account through the contact_customer_accounts relationship, replacing any previous parent customer. Does not create an account or contact. Dataverse enforces security-role privileges. Docs: https://learn.microsoft.com/en-us/power-apps/developer/data-platform/webapi/associate-disassociate-entities-using-web-api#add-a-record-to-a-collection