upwork. The customer asks for a number - is it possible to give?

Question

Upwork

Asks for a number in the correspondence to notify me of orders. I'm new to the exchange, will I get my account blocked if I give the number? and is it allowed at all?

Answer 1

of course allowed

Answer 2

You can communicate both through the Upwork messenger, and through mail, Skype and any other means. This is not prohibited by the rules.