If you have requested a 2FA reset, but you later find one of your missing 2FA methods, you can cancel the reset from your mobile or desktop app.
Desktop
1.
Open the Blockstream app.
2.
Make sure the correct wallet is selected and log in.
3.
Near the top left of the page, click the three dots icon, select Settings, and then Two-Factor Authentication.
4.
Under Request Two-Factor Reset, click Cancel Two-Factor Reset.
5.
Confirm using one of your existing 2FA methods.
6.
You will then be able to use your wallet as normal.