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Solved: How do I fix FortiAuthenticator unable to send SMS message?

This article describes the situation when FortiAuthenticator is unable to send SMS messages.

The below message is appearing because the username is maybe too long:

Unable to send FTM activation message to xxx. FortiGuard server failed sending SMS because message is too long.

Solved: How do I fix FortiAuthenticator unable to send SMS messages?


Step 1: Go to System > Administration > Replacement Message.

Step 2: Choose the relevant SMS replacement message section. It can be ‘FortiToken Mobile Activation SMS Message’.

Step 3: Remove some characters from the default replacement message to make it shorter.

Step 4: Attempt to resend the SMS to the intended user.

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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