Hello @Denis Pasternak !
I suggest to check the CA Policies with the What IF Assistance
You can find it on the CA menu on the upper right
This is where you make a scenario and the Portal displays which Policy affected and which was engaged
Also a quick look on the sign-in logs will show you info on the sign - in attempt
I will also try to recreate the issue
Feel free to add more info
Kindly mark the answer as Accepted and Upvote in case it helped or post your feedback to help !