Can you go to your Windows Settings > Accounts > Access Work or School (note, it is the briefcase icon, not the little person icon). Then see if the organization email address is still listed? If so, click on it and then disconnect it.
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Next, type contro panel in the search on the taskbar to launch it, then go to Credential Manager > Windows credential tab, look for anything referencing the organization account, right click and delete all that is found.
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Hold down Windows + R keys, copy and paste the following path into the run box (one at a time please), and press enter to launch the folder. When it is launched, delete everything in the folder. If you run into any sub folder that will not allow you to delete, go into that sub folder, and delete from within.
%LocalAppData%\Packages\MSTeams_8wekyb3d8bbwe
%LocalAppData%\Packages\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy
%LocalAppData%\Microsoft\OneAuth
%LocalAppData%\Microsoft\TokenBroker
%LocalAppData%\Microsoft\IdentityCache
========================= Restart the computer after that.
Then check to see if the organization account is now gone.