https://www.reddit.com/r/exchangeserver/comments/iyirls/owa_440_error_in_chrome/
1/2) Thanks to this post, I was able to track the source of the problem. The "Local State" file
(Located within Chrome's local user data folder) On windows that's
C:\Users\%UserName%\AppData\Local\Google\Chrome\User Data\Local State
Deleting it will resolve the issue next launch. I'm tracking through the file to see if I can identify a specific setting/issue within the file.
2/2) disabling this flag resolved the problem for chrome, even in CU earlier than CU16
chrome://flags/#reduced-referrer-granularity