Error 100: File Is Missing When Running On Form Request

I call the OnFormRequest Hook in File A. It runs a script that is supposed to set data in related file B. The script works when run outside of FMBF. I get an error 100 file is missing when it runs inside FMBF.

The security is all the same between FMBF, File A, and File B.

The hook is running successfully, and I’m able to write data to File A when running the hook.

What am I missing?

This is pretty much always about privs and permissions,
Do you have the XML gateway enabled in File B?
If it runs locally via the run hook and not on server, it tells me your admin crews are the main thing different.

Checking. Will update shortly.

That was it! New item for the “need to reach into that file” checklist.