From 2 to just 1 emailaddress

Dear Team and Community,
How can I please have just one Emailaddress in Zoom.
I dont know why my private and my business address are saved in zoom.
and I can not change the Sign-in-Emailadress to the other one, "bc its already used".
Doesnt matter now which email it will be, but important thats just one.
that all the mails from Zoom come just to one address.
bc now it looks like, they come randomly to both.
thank you, B