SAML - first login to studio problem

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That stacktrace line from the logs is the actual problem:

cms_1                        |   File "/openedx/venv/lib/python3.8/site-packages/social_core/utils.py", line 248, in wrapper
cms_1                        |     return func(*args, **kwargs)
cms_1                        |   File "/openedx/venv/lib/python3.8/site-packages/social_core/backends/oauth.py", line 375, in auth_complete
cms_1                        |     state = self.validate_state()
cms_1                        |   File "/openedx/venv/lib/python3.8/site-packages/social_core/backends/oauth.py", line 87, in validate_state
cms_1                        |     raise AuthStateMissing(self, 'state')
cms_1                        | social_core.exceptions.AuthStateMissing: Session value state missing.

This is a real problem that I already reported here and that @sambapete also observed here. You should follow the GitHub issue to keep track of the resolution.

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