Send sms using tag from phonebook

i have phonebook where user have tag for any category. I compose new message for users with tag1 (for example). After i send i receive “sending canceled query is empty”.
If i add users via name or phone number all will OK.
Samebody have this problem?
Firstlly my tag is 2 or more words (for example: “my friend”)
I tried use tag from 1 work, 2 word separate “_”. Can not send sms using tag (