Using Classic Outlook on Windows for personal email, calendar, and contact management
Hello,
now we have the answer from the Microsoft support.
So this is something new and they won't change it
I consulted our level 2 to check if there is any incident about the issue and i can confirm that it's a new behavior to just show 500, and they will push through this change. you should search instead of scrolling.
please find bellow the Public Documentation and MC Post.
Public Documentation : Address lists in Exchange Online | Microsoft Learn
MC Post: MC706449 - posted WW
Best regards
Vito