I have the same problem. I can log in in testops, my.katalon.com, admin.katalon…31/03/2023 was the last time that I used Katalon studio with total normally. I log in at my usual place, so no proxy changes have been executed so this post: I am not able to activate Katalon Studio- getting a message to make sure my credentials are valid - #2 by sara.leslie not found for me.(I tried unsuccessfully)