Try the change below - I was not able to check it out so you may need to play with it a little - the idea is to pack the minute filed to at least 3 string characters and then take the 2 characters on the right
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Just adding to Jim's (correct) comment - need to add ,2 at the end of the RIGHT() statement so you take only the right two characters of the # minutes. You could do the same thing for the hours if you'd always like there to be two characters. (eg. 05:00 for 5am).
Another approach using the modulo operator: