SSIS Custom Task Error - Code: 0xC001F02A Source: Package Description: Cannot create a task from XML for task

I am trying to create a custom package. I made a simple test package, to send an email using outlook interop. I was able to get the task to show up in the ssis toolbox by switching the server version to 2012. however i get the following error when trying to run it in vs on my local machine,

Error: 0xC0010026 at Custom Task: The task has failed to load. The contact information for this task is "".

i then tried to run it in dtexec to see if i could get more information.

Microsoft (R) SQL Server Execute Package Utility Version 11.0.7001.0 for 32-bit Copyright (C) Microsoft Corporation. All rights reserved.

Started: 3:53:50 PM Error: 2021-01-14 15:53:50.27 Code: 0xC001F02A Source: Package Description: Cannot create a task from XML for task "Custom Task", type "SSISCustomTaskLibrary.CustomTaskTest, SSISCustomTaskLibrary, Version=1.0.0.0, Culture=neutral, PublicKeyToken=4fdef094ddc47664" due to error 0x80070057 "The parameter is incorrect.". End Error Error: 2021-01-14 15:53:50.27
Code: 0xC0010018 Source: Custom Task Description: Failed to load task "Custom Task", type "". The contact information for this task is "". End Error Error: 2021-01-14 15:53:50.28 Code: 0xC0010026 Source: Custom Task Description: The task has failed to load. The contact information for this task is "". End Error Error: 2021-01-14 15:53:50.28 Code: 0xC0024107 Source: Custom Task
Description: There were errors during task validation. End Error Error: 2021-01-14 15:53:50.28 Code: 0xC0010025 Source: Package
Description: The package cannot execute because it contains tasks that failed to load. End Error DTExec: The package execution returned DTSER_FAILURE (1). Started: 3:53:50 PM Finished: 3:53:50 PM Elapsed: 0.109 seconds

so i fiddled some more and found that if after i loaded the task i switched back to 2019, task disappeared from the toolbox but it ran successfully. however the properties were not working and show an error for every property. I took a screenshot and added it to the project which is located here, https://github.com/w-storey/SSISCustomTaskTestSolution.git

i am using visual studio 2019 with the data tools installed. i added the dll to the gac using these commands

"C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.8 Tools\gacutil" /u SSISCustomTaskLibrary "C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.8 Tools\gacutil" /iF "\source\repos\Tests\SSISCustomTaskTestSolution\SSISCustomTaskLibrary\bin\Release\SSISCustomTaskLibrary.dll" copy "\source\repos\Tests\SSISCustomTaskTestSolution\SSISCustomTaskLibrary\bin\Release\SSISCustomTaskLibrary.dll" "C:\Program Files (x86)\Microsoft SQL Server\110\DTS\Tasks"

so the question is how can I get this task custom task to work?