[ProxyAPI::ProxyException]: Unable to fetch TFTP boot file ([RestClient::BadRequest]: 400 Bad Request)

Support
1

Problem:
I can’t deploy a debian9.5 image to a host because at building time foreman returns the error:
[ProxyAPI::ProxyException]: Unable to fetch TFTP boot file ([RestClient::BadRequest]: 400 Bad Request)
I dont have access to the logs or anything else than the popup message in red when building.

Expected outcome:

Foreman and Proxy versions:
Foreman: Version 1.9.0
Foreman and Proxy plugin versions:

Other relevant data:
[e.g. logs from Foreman and/or the Proxy, modified templates, commands issued, etc]
(for logs, surround with three back-ticks to get proper formatting, e.g.)

logs
2

Without logs, we can’t give you hint. It will be up to you to do the research, identify the misconfiguration and fix it anyway, get those logs.

My wild guess: your installation media is not correctly set and TFTP module cannot download kernel/initramdisk.

Are you sure this is Foreman 1.9? That’s very old version, current stable is 1.19.