The Python package azureml-train is deprecated and seems basically a wrapper around azureml-train-core. When installing azureml-train, if I'm correct it tries to install the azureml-train-core package with the same version number. However, on the 24th of August 2021 the azureml-train package was updated to version 1.33.1 whereas azureml-train-core wasn't updated. This causes the installation of azureml-train to fail.
I would suggest to remove version 1.33.1 of azureml-train such that it still can be installed.
Otherwise, I'm curious why this situation is the case.