Changes to messaging system

Hi OpenRent. When messaging new applicants I usually ask them what dates/times they are available to view. Today 17/7/26 I am unable to do this because a pop up barrier from OpenRent ‘advisies’ me to not book viewings outside of the system. My point is I want to ask the applicant first before I just assume they will be available. Seems rude to just book something without first agreeing?

Why change what worked?