MT Enhanced Plugin for Trados: "One or more errors occurred" when adding to a project.

I had a problem with an SSD and had to do a clean install. When I tried to set up the MT Enhanced Plugin, there was a problem with my Azure account.

I can't get far enough to update the credentials. 

Errors are:

System.AggregateException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

and

System.Net.Http.HttpRequestException, System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a

I have tried uninstalling and re-installing and still can't get past this error code. 

What do I need to do?

Windows 10 Pro Build 2004

SDL Trdos Studio 2019 SR2 15.2.6.2831

MT Enhanced Plugin 4.3.7.0

Error Report

<?xml version="1.0"?>

-<SDLErrorDetails time="6/16/2020 3:06:53 PM">

<ErrorMessage>One or more errors occurred.</ErrorMessage>


-<Exception>

<Type>System.AggregateException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>

<HelpLink/>

<Source>Sdl.Community.MtEnhancedProvider</Source>

<HResult>-2146233088</HResult>


-<StackTrace>

+<![CDATA[]]>
</StackTrace>


-<InnerException>

<Type>System.Net.Http.HttpRequestException, System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</Type>

<HelpLink/>

<Source>System.Net.Http</Source>

<HResult>-2146233088</HResult>


-<StackTrace>

-<![CDATA[ at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
at Sdl.Community.MtEnhancedProvider.MstConnect.ApiConnecter.<GetAccessTokenAsync>d__21.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Sdl.Community.MtEnhancedProvider.MstConnect.ApiConnecter.<>c__DisplayClass20_0.<<GetAuthToken>b__0>d.MoveNext()]]>
</StackTrace>

</InnerException>

</Exception>


-<Environment>

<ProductName>SDL Trados Studio</ProductName>

<ProductVersion>15.0.0.0</ProductVersion>

<EntryAssemblyFileVersion>15.2.6.2831</EntryAssemblyFileVersion>

<OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>

<ServicePack>NULL</ServicePack>

<OperatingSystemLanguage>1033</OperatingSystemLanguage>

<CodePage>1252</CodePage>

<LoggedOnUser>JEFF-HP\jeff</LoggedOnUser>

<DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>

<ComputerName>JEFF-HP</ComputerName>

<ConnectedToNetwork>True</ConnectedToNetwork>

<PhysicalMemory>12400700 MB</PhysicalMemory>

</Environment>

</SDLErrorDetails>