What is the Halo Waypoint “Redeem code” limit?

Hey guys, I’ve hit some sort of invisible limit with redeeming codes, and I was wondering if anyone knew what the limit is?

After 20 successful redemptions, it now gives me an error every time.

Does the 20 limit refresh every month? Every few weeks?

I’ve submitted multiple reports and they’ve all been dismissed d without an answer.
The agent in my last ticket told me to try asking the appoint forums.

Thanks