The oticon app has been installed and was working; now I cannot access it. I have tried filling in the required blanks including the verification code and still cannot access please help.

There is a great deal of difference between Yahoo account key and that of 2 step verification. While account key is designed to reduce your dependence on password, the 2SV or two-step verification plays a pivotal role in enhancing the overall security.
Let's Look at the overall difference.

Yahoo Account Key

With Yahoo account key, it becomes largely possible for you to access the inbox, for which there is no need to utilize any conventional password. However, you will need a smartphone with Yahoo mail app, installed on the device. When you enable the account key, it then sends a notification to your smartphone. Once you approve, you can straightaway access the account.

2 Step Verification

As far as 2 step verification is concerned, you are required to provide your phone number. On entering your phone number, you are required to confirm, whether you want the verification code through SMS or Call.

When you provide the correct phone number, you will then receive a verification code in your mobile. Make sure to enter the code and click on the verify button. From now on, every time you try to access the account, you are required to enter the verification code.

I sincerely hope the answers does provide you with a basic knowledge of the difference between Yahoo account key and that of 2 step verification.
Read source Email Support Numbers

all apps require the code and the code is your apple id if you type it in wrong it wont work.

1 Open the Outlook.com home page
2 Click the "Can't access your account?" link.
3 Select "I forgot my password" and click "Next".
4 Enter the Hotmail address you need access to in the "Microsoft account" field.
5 Select a verification method.
6 Fill out the questionnaire (if necessary).
7 Get your verification code.
8 Enter your verification code.
9 Create a new password.
10 Log into your account.
How to Reset Lost Hotmail Password

A good explanation in detail can be found on this web site:
https://support.google.com/accounts/answer/27441?hl=en

Since the app could access your Facebook, can't you re-install the app? Android or iOS? Or what? Don't panic.
You can create a new temporary email address anywhere, that you can use to recover your facebook password.

Hi
You may find the following works:-

Turning off 2-Step Verification

1. Visit the Using 2-Step Verification page under your Google Account settings. Sign in with your username, password, and verification code if prompted.
2. Click Turn off 2-Step Verification.
3. A pop-up window will appear to confirm that you want to turn off 2-Step Verification. Click OK.

Revoking and destroying passwords and codes to protect your account

If you used App Passwords to authorize applications to access your Google Account, we recommend you go back to using passwords -- rather than App Passwords -- to access these applications. That way, you can revoke your App Passwords so nobody else can use them:

1. Visit the Authorizing applications & sites page under your Google Account settings.
2. Click Revoke for any application or device whose code you want to revoke.
3. For each application that you revoked an App Password, you'll need to reauthorize the application by entering your username and password, as you did before you turned on 2-Step Verification. You might not be prompted for this information the next time you use the application as some applications will take longer to recognized that an App Password has been revoked.

In addition, remember to destroy all backup codes that you had been using to verify this account.

Good luck.

Fix Mail Apps and Devices Show Incorrect Password Error After Enabling 2...
[Fix] Mail Apps and Devices Show Incorrect Password Error After Enabling 2-Step Verification in Microsoft or Gmail Account "2-step verification" is an important security feature which protects your online account whether its your email account or a social networking account. It asks for an extra security code each time you try to sign in to your account. This security code is sent to your registered mobile phone or alternative email ID.
Recently Microsoft enabled this 2-step verification feature for Microsoft accounts which are used for emails, Windows 8, XBox, etc. On the other hand Google is already providing two-step verification in its Gmail service since long time.
If you enabled 2-step verification feature in your Microsoft or Gmail account, you might be facing a weird issue. If you try to access your email account using an email client such as Windows Live Mail, Thunderbird, Microsoft Outlook, etc, it'll now allow you to sign in using your current password. It'll show you an incorrect password error message even if your password is absolutely correct. The same problem will also occur if you try to sign in using your Microsoft account in devices such as Xbox 360 or Android smartphones.
Now the question comes why does this problem occur? Why do these mail apps and devices not accept your correct password? The answer is very simple. These mail apps and devices were not designed to ask you for the extra security code which is required for 2-step verification. Since these apps and devices don't ask for security code, the 2-step verification procedure is not completed successfully, hence you can't sign in using your credentials in those apps and devices.
So what's the solution? The solution is very simple. Every company which provides 2-step verification feature, also allows you to create special passwords for these mail apps and devices. You can create separate passwords for each app and device and then you can use that special password to sign in to those apps or devices. Now those apps and devices will accept the new password and will allow you to access your account without any problem.
So if you have enabled 2-step verification feature in Microsoft or Gmail account and if you are facing login password problems in mail apps or devices, you just need to create above mentioned special passwords or codes to sign in without any problem.
Just follow these simple steps to create app passwords for your Microsoft or Gmail account:

A. Create App Password in Microsoft Account 1. Open your Microsoft account security settings page by clicking on following link:
Open Microsoft Account Security Settings Page
2. You'll see "App passwords" section at the bottom of the page which shows following information:
Some apps and devices don't support security codes. In these cases, you need to create an app password to sign in. 3. Click on "Create a new app password" link and it'll immediately provide you a new password generated randomly.

Now you can use this new password to sign in to a 3rd party mail app or device.
B. Create Application Specific Password in Gmail Account

1. Open your Google account settings page by clicking on following link:
Open Google Account Settings Pag
2. Now click on "Security" tab given in left-side pane. Scroll down on the page and you'll see "Connected applications and sites" section at the bottom of the page.
3. Click on "Manage access" button and it'll open a new page showing following information:Some applications that work outside a browser aren't yet compatible with 2-step verification and cannot ask for verification codes, for example: email programs including Outlook, Apple Mail, or Thunderbird, older Android smartphones. To use these applications, you need to generate an application-specific password. 4. Type any desired name in given text box and click on "Generate password" button.That's it. It'll immediately provide you a new password which can be used in any mail app or device to sign in.PS: If you want to remove or disallow any mail app or device to access your account, you can remove existing app password or revoke access from devices using the same account security settings pages as mentioned in above instructions.

how that helps good luck.

Your app has to request permission from the person to install the app, or allow it access to their profile. There's no way to do this. There MUST be user interaction.

You can do this through programming via PHP where the user is requesting your App. Then the user gets a verification to allow your App access to their profile.