Hi @Janani_M 


Yes we can disable the Meet Now Meeting in the Channels on the Tenant Level. But for the individual user who have a Meet Now Option in the Calendar that cannot be disabled completely. 


For Disabling the Meet Now Options in the Microsoft Teams Channel you need to follow the following steps:-


1. Login into Office 365 Portal and Navigate to Teams Admin Centre

2. On the Left Click on Meeting > Meeting Policies > Edit Global Policy > Allow Meet Now in Channels


Using the above you can Turn On or Turn Off the Meet Now Option in the Channel. Let me know in case you need any additional assistance.


With Regards,

Satish U