I was trying to upload to appstore but I was facing this error App Store Connect Operation Error Authentication failure. Session is invalid, session has been deleted. So here I just deleted my account from preferences, then i added it again. It has worked fine for me. I am still using catlina and xCode 11.2.x.
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I did that weeks ago, but there is no luck for me. I am trying it to setup now for more than a month. Apple is working very slow on it.