For StartUP if no office hours are set the system assumes that you are out of office. So make sure that you have configured office hours for all necessary days.
If you are still facing the issue here are a few things to try:
1. Navigate to "Call handling" and find your reception extension (I assume its an Digital receptionist). Edit it and check if there are any Assigned DIDs to it. If there are remove them and try again.
2. If that fails to resolve your issue click on your user icon on the top and select the "Override Office Hours" option. Make sure that there is no override configured.
If there is not force the hours to "Office is open" and see if that helps.
3. If the above fail and you still have issues go to the "Office Hours" menu and change the "When office is closed route to" destination to something else. Check if the call is routed to that destination.