Codes land in the wrong place. Links loop back to an account you were not using. Sometimes nothing happens at all. It is a very fixable problem once you know what is causing it.
Why one computer gets confused
Your browser stores login information in its cookies and cache. That is normally a kindness. It is why you are not asked to sign in to Facebook forty times a day.
When two accounts share one browser, that stored information becomes the problem. The browser keeps handing over the login it remembers, so a code link redirects to the account it already knows rather than the one you have in mind. The link is fine. The browser is just being helpful about the wrong thing.
The clean switch, step by step
1. Finish collecting everything for the first account before you start switching. Half-finished lists are how chips get lost.
2. Log all the way out of Facebook, not just out of the game. A partial logout leaves the cookie behind.
3. Log in to the second account.
4. Now open your codes and collect. Because the browser is already signed in as the second player, the chips go where you meant them to.
If it still misbehaves, clear your browser's cache and cookies and try again. That wipes the stored logins, so both accounts start from a clean slate.
The easier way: a private window
A private or incognito window is the shortcut, and it is the method we would suggest to anyone doing this regularly.
A private window stores no cookies and no cache. It has no memory of who was signed in five minutes ago and no memory of you afterward, so there is nothing to conflict with anything.
Use your normal browser window for one account and a private window for the other, and the two never touch. Close the private window when you are finished and it forgets everything on its way out.
What this does not change
Switching cleanly gets each account to the right place. It does not create extra chips, and it is worth being clear about that.
Every promo code works once per account, ever. Two accounts means each one can collect a given code once, which is a function of them being separate accounts, not a trick. And nothing about switching resets a code you have already used on either one. Nobody can do that, including DoubleDown.
Keep in mind too that DoubleDown chips are play money with no cash value, so there is nothing to be gained here beyond a bit of extra spinning.
Signed in as the right player? Good. Work your way down the day's list at https://www.ddpcshares.com/double_down_c ... tion_codes and enjoy the chips.