Could not load file or assembly 'Oracle.ManagedDataAccess'

we are developing a windows service which connect to oracle database. We use Oracle ManagedDataAccess from Nuget package. When running the windows service we are receving below error. Tried to get details from stackoverflows and nothing is able to resolve the problem. Our config file is as below

Could not load file or assembly 'Oracle.ManagedDataAccess, Version=4.122.19.1, Culture=neutral, PublicKeyToken=89b483f429c47342' or one of its dependencies

Config

<?xml version="1.0"?>
<configuration>
  <configSections>
    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <section name="eClaimsService.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/>
      <section name="oracle.manageddataaccess.client"
      type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.122.19.1, Culture=neutral, PublicKeyToken=89b483f429c47342"/>
    </sectionGroup>
  </configSections>
   <system.data>
    <DbProviderFactories>
      <remove invariant="Oracle.ManagedDataAccess.Client"/>
      <add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver"
        type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.122.19.1, Culture=neutral, PublicKeyToken=89b483f429c47342"/>
    </DbProviderFactories>
  </system.data>
  <system.web>
    <httpRuntime executionTimeout="3600" requestValidationMode="2.0" maxRequestLength="10240"/>
    <sessionState mode="InProc" timeout="60"/>
    <pages validateRequest="false" />
  </system.web>
</configuration>