The 01019 return code means that you are trying to send a message with a SMS SenderID (Number Mask) that has not been provisioned for your account or that it exists in the IMDA SenderID Registry Blacklist.
See related article: https://support.commzgate.com/hc/en-us/articles/4481202561177-Important-notice-regarding-use-of-SMS-SenderID
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