Changed e-mail address for digital legacy contact
I have been designated as a digital legacy contact for a friend, but under the rubric "Contact for digital legacy for" my friend is listed with an e-mail address he never uses and which is not the e-mail address for his Apple ID: it seems to have been created automatically and contains the beginning of his Hotmail address (which he uses all the time and which is also the e-mail address for his Apple ID) followed by @icloud.com. Might this be a problem, should I need to use the access key one day? Is there any way to change this e-mail address?
iPhone 12 Pro Max