Microsoft Authenticator no network connection - two-factor-authentication

I facing an issue on Microsoft Authenticator App it didn't work I got below error message
No network connection
Add account failed .Please check your internet connection and try again
now I can't login into all accounts that already I enabled the 2 Factor Authentication on them ! Does anyone faced that problem ?

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Using windows authentication but getting access denied

I created a db via app-data folder, migrated over to server explorer and tried to connect to it and I get
Cannot open database "abc" requested by the login. The login failed. Login failed for user 'xyz'. I came across this: [Cannot open database “test” requested by the login. The login failed. Login failed for user 'xyz\ASPNET'
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Second is concerning this:
UPDATE: Ok, you're using integrated Windows authentication --> you need to create a SQL Server login for "xyz\ASPNET" on your SQL Server"
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I thought the purpose of win authentication was so you didnt have to type login and pass to connect. You're automatically connected through windows. Right?

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A few years ago I signed up as a LinkedIn developer, registered an application and received my Client ID and Secret.
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I've developed a website which connects to a SQL Server 2012 instance. This works fine in my development environment. However, when trying to deploy to a production environment, the page returns the following error:
Server Error in "/theapp" Application.
Invalid User Account
Description: an unhandled exception occured during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code
Exception Details: System.Data.SqlClient.SqlException: Invalid User Account
screen shot of stack trace
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Thanks kindly!
Update (4/7/2016 # 3:18pm): The service account is a domain account which has correct permissions on the database. In addition, the same account is used by another website to connect to the same database, and this works fine.
Update (5/7/2016 # 10:16am): The only thing I can think of is something to do with the usage of LINQ to SQL queries within the application. Does this sound like a possible cause?
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If you are using integrated security, i.e. windows authentication, verify if the user have given permission on sql.
When you pass Windows authentication through a website, the identity of your app pool is the user credentials that are supplied. Be sure your app pool for the site is set to use the same user as you expect in the identity of the app pool. Also, be sure integrated security is set to SSPI, not true, in the connection string.

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