If you are resgitering BUSY for using for demo,you need to regsiter it,if you are not recieving otp while registering,
you can ceck these thing:
Step 1:You need to check it first,your internet should be properly working on your system,
Step 2:check phone number and mail id should be correctly mentioned,
Step 3:If internet is working properly then you can check anti-virus on your system,
Step 4:Exclude BUSY from anti virus,
Step 5:Check window defender,allow BUSY from there.
Step 6:Then check in BUSY,regsiter again then you will recive otp,mention otp then register for demo.