...
- no account signature image was configured at the time when the workstep for the signer was created (which is typically when the signer is invited to sign via email; but can be, for the first recipient, the time of sending the envelope e.g. when sending emails is disabled)
- the recipient was an unregistered signer at the time of sending the envelope, but an account was registered (and signature image was configured) after sending the envelope.
