I’m sharing this to the community in case someone might need it.
I have a procedure that creates users in automatic and this was not working in Safari and Firefox. It took me a lot to understand the reason. In the same WF, though in a different step, I was getting the IP of the user. This was done with a plugin named Ipify that apparently had some issues. I replaced the plugin with another one named IP Address Complete #Geolocation (by Flusk) and now everything works smoothly.
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