configuration file does not contain the required providerName attribute, Azure Api - azure

Question

I made an azure web app. When I go to my web app URL it says the app is up and running, https://nameofmyapp.azurewebsites.net/.
When I try to go send a request for the web API by going to https://nameofmyapp.azurewebsites.net/api/Menus to get JSON text I receive this error
{
"Message": "An error has occurred.",
"ExceptionMessage": "The connection string 'PetSchedulerDbContext' in the application's configuration file does not contain the required providerName attribute.\"",
"ExceptionType": "System.InvalidOperationException",
"StackTrace": " at System.Data.Entity.Internal.LazyInternalConnection.InitializeFromConnectionStringSetting(ConnectionStringSettings appConfigConnection)\r\n
Here is my connection string:
<connectionStrings>
<add name="PetschedulerDbContext" connectionString="Server=tcp:petschedulerserver.database.windows.net,1433;Initial Catalog=petschedulerdb;Persist Security Info=False;User ID=Julia;Password=Network5!;MultipleActiveResultSets=False;Encrypt=True;TrustServerCertificate=False;Connection Timeout=30;" providerName="System.Data.SqlClient" />
</connectionStrings>
I have tried changing the provider name to
providerName="System.Data.EntityClient"
with the same result. I don't understand what the required provider name would be? Please let me know if you need more information.

Answer 1

Here are my cents for this issue:
Prerequisite: Please make sure you have the same set of connection string value in the Azure portal Web app configuration setting as well.
If you are using designed based approach, then you need to define the connections string that the designer generates and which looks something like this:
<add name="Northwind_Entities"
connectionString="metadata=res://*/Northwind.csdl|
res://*/Northwind.ssdl|
res://*/Northwind.msl;
provider=System.Data.SqlClient;
provider connection string=
"Data Source=.\sqlexpress;
Initial Catalog=Northwind;
Integrated Security=True;
MultipleActiveResultSets=True""
providerName="System.Data.EntityClient"/>
If you're not using the designer (if you don't have an .edmx file), the connection string should look like this:
<add name="ConnectionStringName" providerName="System.Data.SqlClient" connectionString="Data Source=ServerName;Initial Catalog=DatabaseName;Integrated Security=False;User Id=userid;Password=password;MultipleActiveResultSets=True" />
Additional reference:
https://learn.microsoft.com/en-us/ef/ef6/fundamentals/configuring/connection-strings?redirectedfrom=MSDN
https://forums.asp.net/t/1858681.aspx?The+connection+string+EFDbContext+in+the+application+s+configuration+file+does+not+contain+the+required+providerName+attribute+
Hope it helps.