rhel 9.4 grub2 bootloaded for pxe installation does not work

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I tried to follow the instructions to install rhel 9 from network that is documented at this link
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/performing_a_standard_rhel_9_installation/index
in the section
2.5.2. Configuring the DHCPv4 server for HTTP and PXE boot
This worked for rhel 9.3 but, using rhel 9.4 instead, I think that the file BOOTX64.EFI (located in the iso image in the directory \EFI\BOOT) could be corrupted because I have this error on the target computer console:

Fetching Netboot Image revocation.efi
Unable to fetch TFTP image: TFTP error

using exactly the same configuration and the file from rhel 9.3, it works properly.
Is it corrupted for rhel 9.4 or I'm doing something wrong?
Thanks.

ST

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