Continuing the support related to the new issue here. Thank you for sharing all the details and the information about what you have done in order to try solving the problem.
To help you with a better support I will need that you share a temporary access with me, so I can check the logs and some extra advanced settings on your site. Could you please share a temporary access? This is super private and if you agree with it, please share the access on the form you'll see above this reply. This will keep the information private and nobody will have access to it.
Please do not share access if is not on the private form or email.