SSMS refuses to start 2

Question

This question is pretty similar with this one - SSMS refuses to start. However, a completely different *.dll is in question. Applying the solution from that answer doesn't help. I ran ssms.exe with logging and this is the error entry:

<entry>
    <record>32</record>
    <time>2024/08/26 09:09:04.056</time>
    <type>Error</type>
    <source>VisualStudio</source>
    <description>CreateInstance failed for package [Task Scheduler Package]Source: &apos;mscorlib&apos; Description: Could not load file or assembly &apos;Microsoft.VisualStudio.Platform.AppDomainManager, Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&apos; or one of its dependencies. The keyset is not defined. (Exception from HRESULT: 0x80090019)&#x000D;&#x000A;System.IO.FileLoadException: Could not load file or assembly &apos;Microsoft.VisualStudio.Platform.AppDomainManager, Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&apos; or one of its dependencies. The keyset is not defined. (Exception from HRESULT: 0x80090019)&#x000D;&#x000A;File name: &apos;Microsoft.VisualStudio.Platform.AppDomainManager, Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a&apos; ---&gt; System.Runtime.InteropServices.COMException (0x80090019): The keyset is not defined. (Exception from HRESULT: 0x80090019)&#x000D;&#x000A;   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)&#x000D;&#x000A;   at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)&#x000D;&#x000A;   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)&#x000D;&#x000A;   at System.Activator.CreateInstance(String assemblyString, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, StackCrawlMark&amp; stackMark)&#x000D;&#x000A;   at System.Activator.CreateInstance(String assemblyName, String typeName)&#x000D;&#x000A;   at System.AppDomain.CreateInstance(String assemblyName, String typeName)&#x000D;&#x000A;   at System.AppDomain.CreateInstanceAndUnwrap(String assemblyName, String typeName)&#x000D;&#x000A;   at System.AppDomain.CreateAppDomainManager()&#x000D;&#x000A;&#x000D;&#x000A;System.Runtime.InteropServices.COMException (0x80090019): The keyset is not defined. (Exception from HRESULT: 0x80090019)</description>
    <guid>{00CD9DDA-7350-457C-A240-71BD667FC4DE}</guid>
    <hr>80004005 - E_FAIL</hr>
  </entry>

Does anyone have an idea how to solve this. The issue started all of a sudden after I hadn't touched my laptop for a month.

Reparing the installation doesn't help. Uninstalling and reinstalling doesn't help. I even tried removing the shared components in between installation hoping it is one of them. Installing previous versions of ssms yields the same result. Clearing app data for the application doesn't help as per some recommendations.

If I open procmon.exe and monitor ssms.exe process I can see that this assembly is in fact found and loaded. I am not sure if there is some other referenced assembly missing.