How can Visual Studio Source Control Explorer not remove projects that have been deleted in TFS Online?

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There are a few potential reasons why Visual Studio Source Control Explorer may not remove projects that have been deleted in TFS Online:

1. Pending changes: If there are pending changes related to the project, Visual Studio may not remove it from the Source Control Explorer until those changes are committed or reverted.

2. Permissions: If the user does not have sufficient permissions to delete projects in TFS Online, Visual Studio may not be able to remove it from the Source Control Explorer.

3. Workspace mappings: If the project has been deleted in TFS Online but is still mapped to a local folder in the user's workspace, Visual Studio may not remove it from the Source Control Explorer until the workspace mappings are updated.

4. Server cache: If TFS Online has cached information about the deleted project, Visual Studio may not remove it from the Source Control Explorer until the cache is refreshed. This can be done by manually refreshing the server cache or waiting for the cache to expire.

To troubleshoot this issue, users can check for any pending changes, update their permissions, update workspace mappings, and refresh the TFS Online cache.