JoinMeetingParams.displayName not working

Hello) Meeting SDK Android Version 6.1.0
I’m trying to use SDK to connect to a webinar. The webinar has a mandatory registration feature enabled. If this function is enabled, then when connecting, JoinMeetingParams.displayName stops working and the host sees the name specified during registration. Is it possible to somehow change this behavior?

P.S.
This problem is observed only on mobile SDK, on ​​WEB SDK the userName parameter works and you can write any name, it will be seen in the webinar.