Messaging problem

I've made a macro that lets you send messages, but sometimes some messages don't go through, i.e. out of 20 SMS messages, maybe one doesn't go through and it opens the message box, then the text that was supposed to be sent is written, but the text is written in the dialog box but isn't sent.
 
I've made a macro that lets you send messages, but sometimes some messages don't go through, i.e. out of 20 SMS messages, maybe one doesn't go through and it opens the message box, then the text that was supposed to be sent is written, but the text is written in the dialog box but isn't sent.
Previously, it didn't work properly when I sent, for example, the 20 SMS messages, but now when I send the 20 messages, one doesn't leave and it writes the text it's supposed to send in the dialog box. I don't know if it's the application updates or a bug.
 
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