Hi, dear and thanks for your support!
According to your picture, you had the prefix (9000) configured. I advise you to change it to 8.
In order for it to be a simple call, the prefix must be a combination of a bit from the long number or a bit from the short number.
Then, you can call the long number (the prefix is a bit from the long number) or call the short number (the prefix is a bit from the short number).