E04099 — EmailTemplateContactRequired

This template reads contact attributes, but a To recipient has no matching contact in this workspace.

• HTTP status: 422
• Type: validation_error
• Name: EmailTemplateContactRequired

What to do

Create or update a contact for the original To recipient, using the displayed mailbox's email address if it has a display override. Alternatively, use a template with caller parameters instead of contact attributes, then retry the send. Cc and Bcc copies need no matching contact.

Operations that resolve this:

• Create a contact

Related

• E04xxx — Email sending & delivery: every code in this range
• Errors: the full wire contract, status mapping, and error catalog
• Error handling: branching on type and code, validation details, and vendor_code