I just noticed this also.
I am wondering about this also.
Chase FAQ says this.
"Do you share full account numbers? What is a substitute account number?
When you agree to share account numbers with a third party, we won't share your actual account or routing number. Instead—when necessary to allow transactions from eligible checking and savings accounts—we'll share a "substitute account number." This is a different account number that replaces your actual account number in each transaction to keep your details safe. Authorized third parties can use substitute account numbers for same-day or scheduled transactions as long as you continue to authorize it. For your security, you can turn off a substitute account number to prevent it from being used for new transactions. You can do this by disconnecting your account from the authorized third party."
What does it mean when a substitute account number is turned off?
"It means authorized third parties or any service they use won't be able to submit new transactions, either individually or as a part of a scheduled recurring transaction. When you remove an eligible checking or savings account that has a substitute account number, that substitute account number will automatically be turned off. Any payment requests already received will be processed, but it may take up to 3 days. To turn a substitute account number back on for new transactions, you'll need to share that account with your authorized third party again."
I have not turned it on.
Edit: I decided to turn it on to see what happens.
I always had it on, and haven't really noticed much difference than what I would expect:
Switching might cause the need to reauthorized, but I don't know.
@Chris_QPW
I just ran OSU and I was not asked to reactivate or reauthorize the accounts. (So far)
