Unclickable button "start conference conference

[Kirito8881]

In the zoom application on your phone, the button to create a conference (start a conference) is not clickable, it is transparent. If you delete zoom and install it again, then the first time you log in everything is fine, but if you close zoom and start it again, the create a conference button will still be unavailable, please tell me what’s wrong, this has never happened before, not for me one such problem.