Problem with pre approvals

[Robert106]

I received a request for a rental and I have to pre-approve. When I press the pre approve button, I get an error saying that my calendar is not available, however it is. What could cause this problem, and how can I get around it? The person requesting the rent cannot confirm it!

[Luisa42]

Hallo, if I have pre approuved a requested but on the calendar the house is Still free, and I received an other request for the house in the same period, can I accept this?

Luisa 

[Sylvaine2]

If I pre-approve, does the client's credit card automatically get debited?

Thanks for answer,

SC