Why is my code for MTN dew halo not working :(

its not the code its not letting me put in my birth month

so what if my xbox code im trying to redeem doesn't redeem, and lets say i try to redeem it before and after the expiration date. and it still doesn't work, then what do i do? do i get the 1 month xbox ultimate for free? this is happening to my friends and mine account. we are trying to redeem the codes, we put the code into the redemption thing. and when we hit "submit" nothing happens.

I know they give you a single point to redeem on like game skin and stuff so by actually redeeming that point does that in turn send of the game pass code to you? What I'm saying is like you redeem a skin and then have to use it to your gamertag and then maybe once done it recognizes your gamertag with the redeem skins and then sees your email you used to sign upon the Xbox Mtn Dew/Rockstar/Doritos and it is linked to your gamertag so then it finally send it out?

I hope that made sense. I hope that would be the issue.

Thank you very much for your patience and understanding! If you need anything else, do not hesitate to contact us again.

It works now, thanks for the help, I went to terms and conditions and entered my mailing address and it auto filled the rest, and the codes work, thanks again.