object reference not set to an instance or object with termbases

I'm getting this error when trying to connect to server termbase or adding to a local one. I have reinstalled Trados2019 and MultiTerm 2019 several times and am still getting this error every time. I know there is nothing wrong with the server termbase as other translators are using it without difficulty. None of the fixes previously posted here have done anything. Any ideas?

<?xml version="1.0"?>
-<SDLErrorDetails time="20.10.2020 17:08:22">
<ErrorMessage>A connection to SDL MultiTerm Server groupshare.eurocom.at could not be established. Invalid Login Details</ErrorMessage>
-<Exception>
<Type>Sdl.Terminology.TerminologyProvider.Core.Exceptions.ConnectionException, Sdl.Terminology.TerminologyProvider.Core, Version=15.0.0.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888</Type>
<HelpLink/>
<Source>Sdl.MultiTerm.Client.TerminologyProvider</Source>
<HResult>-2146233088</HResult>
-<StackTrace>
-<![CDATA[   at Sdl.MultiTerm.Client.TerminologyProvider.TerminologyPrioviders.ServerBasedMultiTermTerminologyProvider.Connect(TerminologyProviderCredential credential, TermbaseSettings settings)
   at Sdl.MultiTerm.Client.Terminology.UI.TermbaseSelectorList.ShowLogInDialog()]]>
</StackTrace>
-<InnerException>
<Type>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
<HelpLink/>
<Source>Sdl.MultiTerm.Client.TerminologyProvider</Source>
<HResult>-2147467261</HResult>
-<StackTrace>
-<![CDATA[   at Sdl.MultiTerm.Client.TerminologyProvider.Utils.GetMACAddress()
   at Sdl.MultiTerm.Client.TerminologyProvider.Utils.GetClientUniqueId(String userID)
   at Sdl.MultiTerm.Client.TerminologyProvider.TerminologyPrioviders.ServerBasedMultiTermTerminologyProvider.Connect(TerminologyProviderCredential credential, TermbaseSettings settings)]]>
</StackTrace>
</InnerException>
</Exception>
-<Environment>
<ProductName>SDL Trados Studio</ProductName>
<ProductVersion>15.0.0.0</ProductVersion>
<EntryAssemblyFileVersion>15.2.5.2145</EntryAssemblyFileVersion>
<OperatingSystem>Microsoft Windows 10 Home</OperatingSystem>
<ServicePack>NULL</ServicePack>
<OperatingSystemLanguage>1033</OperatingSystemLanguage>
<CodePage>1252</CodePage>
<LoggedOnUser>DESKTOP-5605BRU\Dave</LoggedOnUser>
<DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
<ComputerName>DESKTOP-5605BRU</ComputerName>
<ConnectedToNetwork>True</ConnectedToNetwork>
<PhysicalMemory>16691976 MB</PhysicalMemory>
</Environment>
</SDLErrorDetails>

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