I am turning 21 this month and will be switching my license to a TN one as my old one expires on my birthday. TN takes an out of state license upon switching them though, so will using just the temporary be an issue?

Temp will have a picture on it. Your original will be mailed to verify home location.

If it doesn't have a picture I'd say yes. Do you have a student ID to take along with new license maybe that would work.

The temporary ID’s come with a picture on them and they are also able to scan, but they are just a piece of paper. I have my work ID that is current and has a photo on it