To restrict multiple users using the same Zoho account, there is a limit to the number of times you can sign in to your account, which is 20 times per day (time is based on your account's datacenter timing). If you receive an error message stating your daily sign-in limit has been reached, you can wait until the end of the day (based on your datacenter time) or contact Zoho Accounts Support at support@zohoaccounts.com.

You can refer to our troubleshooting article for more information.