My voucher from Modern States is different...

[alexf.1990]

I just received my CLEP voucher for American Lit this afternoon and noticed that something was different about it. It says (This CLEP voucher code is due to expire 6/29/2019. Please purchase your CLEP exam by 6/29/2019.)
My last voucher I got for the French exam did not have this expiration date. I actually never used it - could this be why?
The American Lit voucher number is 31295. Has anyone else gotten an expiration date on their vouchers? I'm scheduled to take the exam on July 2nd, so the expiration date shouldn't be a problem. 

I've never noticed an expiration date on for the voucher code. Once you use the voucher code to purchase the CLEP registration, you have 6 months (I think) to redeem that registration. Is the expiration date on the voucher code Modern States gave you or the registration you received from the College Board?