Setup Timezone

about Timezone area

The time zone of the account must match the time zone of your primary device on which the main WhatsApp runs.
To ensure that messages arrive safely and quickly, and to maintain your WhatsApp account number

To access the time zone of the account: From the menu above, “Click on Avatar” > Account

Now you are in your account settings here: From the Timezone field choose your time zone

Then press the Submit button