ACT NOW: The Alteryx team will be retiring support for Community account recovery and Community email-change requests Early 2026. Make sure to check your account preferences in my.alteryx.com to make sure you have filled out your security questions.
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Make sure the specified end user email address is correct. Can you try to enter your full email address in the Username part of the configuration?
Check to see if there is any restriction (i.e., a firewall) which could truncate XML responses larger than a certain size, or a load balancer/packet accelerator that is interacting with the network traffic.