Typically,
the signatory does not receive the OTP for one of these reasons:
Important notice: There is currently an intermittent issue whereby some international mobile numbers are NOT receiving OTP’s via SMS from the eSign service.
This is occurring due to the mobile network provider blocking SMS's from an originating number "outside" network service providers country. Our understanding is the SMS’s are being blocked by the mobile network providers as potential spam in an effort to protect their clients and in some cases due to a change in legislation.
If this is occurring, please contact your network service provider to see if this can be resolved.