Hello benfdc! 👋
I've looked into this and you seem to be right that Fidelity Investments only supports Symantec VIP Access Tokens at the moment. What appears to have happened in this case is that a user seems to have managed to generate a TOTP one-time passcode from the Symantec VIP Access Token, saved the TOTP one-time passcode in 1Password, and then reported that 1Password in the browser wasn't filling that TOTP one-time passcode on the Fidelity website. The fix mentioned in the release notes refers to the fact that we've fixed the specific filling issue reported by the customer.
However, I'm not aware of the method used by the customer to generate the TOTP one-time passcode in the first place.
I hope that helps. 😊
ref: dev/core/core#11128