The IRS is now offering offline TOTP generation via their IRS2Go app which requires an IRS username (8-64 characters, no spaces or special characters other than _) and a key shown on their site, in my case, an 8-digit number. With these two items, it generates a 6-digit number every 60 seconds. I know 1Password only supports a TOTP period of 30 seconds, but it'd be useful to reverse engineer what their app is doing behind the scenes and how it's combining the username and password into one secret to generate the code so it could be done with other software. I tried colon or pipe as a delimiter with no luck. Any suggestions?
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