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Had a look with one of my colleagues over the problem, and currently we're investigating the issue.
The number one lead, at the moment, is related to the lack of USER UUID in the output of op account list. Since the suffix of the environment variable uses the UUID to identify the corresponding session, our hunch is, currently, that the CLI cannot tie the session to a specific user. We're looking into finding out what might have caused the USER UUID to not have been populated during the account add process. Will keep everyone up to date as we find out new details, thanks you everyone for reporting, in the meantime!