Viber API problem sending messages?

Question

API

There is a public Viber account
There is a PHP script that collects some data from the table -> generates a message and sends it to this account
When you run the script from a browser, everything works properly, messages reach everyone who is subscribed
But if you run the script from the command line or via cron
All recipients have the same error
[status] => 999
[status_message] => Bad receiver ID
[message_token] => ********************
error descriptions in did not find documentation (apparently it appears as Other error code)
The script has to work on cron
Who faced or can ideas what is?

Answer 1

If someone suddenly encounters the same problem.
The problem turned out to be in the encoding
. In my case,
when generating messages, the strtoupper and substr functions were used.
Replacing with mb_strtoupper and mb_substr, respectively, fixed the situation.