How long does It take to get an Account String set up in the system?
As the Account String needs to be “validated”, and validation occurs daily, the time is currently estimated to be 24 hours.
There are two "syncs" that enable the strings in Gateway each day. One is at 10:25am and the other is at 10:25pm. If you can make your changes early enough in the morning before the first daily sync, your string should validate in time and be useable that day.