Hello,
it's a well known bug from Microsoft, with the last update on Windows 11, the version 24H2, we are experience a lot of problems when Excel 2016 is launching.
Excel HANGS and we have to kill Excel by task manager. It's incredible why Microsoft do not have create a emergency case for this. We are waitig for patch correction.
I found a solution with a great guy who create a script that launch in background task MS Office 2016 Excel and Word. Then the problem is bypassed for the moment !
https://www.reddit.com/r/sysadmin/comments/1hnas4d/windows_11_24h2_update_cannot_access_network/