Error: Failed to make XHR request [0x80070057] Request header field [my-header] is not allowed by Access-Control-Allow-Headers in preflight response about office-js

[Tr59]

As additionnal information we do send "Access-Control-Allow-Origin", "*"" in the response header. It is not in the log file because i made a mistake when i pasted the log file content

Thanks

[Tr59]

Here is a copy of the request captured by Fiddler

[ndeleuze]

@Tr59 was this POST request successful at some point and it is no longer working?

[Tr59]

This request worked until February.
Following an Office update earlier this week, the problem is no longer present.

Version 2404 (build 17531.20120 Office)