Unable to log in to secure program after latest update on iPhone

“Unable to log into secure program after latest update on iPhone: Since my last Apple update to my Apple phone not able to get my secure password email t log. T my computer program.”

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Seems Two-Factor Authentication is being Used:

So, which app is this for?

• If Apple, add your phone number as a trusted device for Two-Factor Authentication: Two-factor authentication for Apple Account - Apple Support

• If NOT Apple: Contact the Developer asking them the email address this is sent from, and then add it to your Contacts list or Safe Senders list

“Unable to log into secure program after latest update on iPhone: I cannot get my Greenway update to log into my secure program since the latest update on my Apple phone.”

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Troubleshooting Logins After an Update:

Disable All VPN Connections:

If you cannot log in n an app or Website, then see if you have a VPN enabled. If so, disable it, and try the login, once more.

Update the App:

See if you can somehow update your app. It may be required to be performed, having just now installed a new operating system.