No one who has submitted their application in the last couple of months is allowed to secure an appointment at the moment.
The UKVCAS centres are only just opening up after being closed since March, and they are only allowing certain people to book biometrics at the moment.
First they allowed people who had booked an appointment back in March but who had their appointment cancelled to rebook.
Now they are making their way through the applications and allowing people to book appointments in order of when they submitted their application. They are emailing the people who are now allowed to book.
So, you will have to wait for them to get through the March, April, May and most of June appointment bookings first before you will be allowed to book yours. Which means it could be several weeks, at least, before you can book your appointment.
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