@Kayleigh62 It depends on where the property is. In many parts of Europe hosts need this info to report to the authorities. In other places (such as some states in the USA) hosts want to do their own identity checks to make sure they know who is staying in their listing. Whilst passports are important mine have been sent many times to hotels, embassies etc without issue. On balance, provided the host has good reviews, I would send it BUT if there is any suggestion to pay off-platform then run a mile.
Let us know how it goes.