Can anyone help?! Credit limit £0

Okay I am super confused. Downloaded and set up my account yesterday. Given a credit amount of £2500, used £88 of that. I have longed into my account this morning and my credit limit it now £0? Can anyone please explain what’s going on. Why has it gone from £2500 to £0 and why was I able to use it yesterday?

I need to send my ID how do I do that

I have a new account. Card just arrived. Do I get a pin via the post ? Can’t activate card until i have one.

Go to the card section of the app and click show pin.