This probably isn’t really appropriate for a Halo help forum, but 6 years later, I’m trying to redeem my Gold trial (digital copy) and it keeps saying there were too many log-in attempts on my Microsoft account.
6 years later? Can you check on the card (which has the code) and see if the expiry date has passed
This is not a Halo related support request. Please refer to Xbox Support for account related things.