Great question — answering as the UphillTech team:
In the tutorial, prior to start using fdisk, they label the disk with parted as DOS. Have you skipped that step?, if you create a new label for that disk (DOS partition table, using fdisk for example but you can also follow the tutorial and use parted), then create a new partition and then list all of the partition types, you will get the desired 'fd' between the results. If the disks instead have a GPT partition table, you won't find 'fd', but numbers from 1 to 108 (fdisk version in Debian 11 repos) for each of the possible partition types. Hope this helps.
Full answer by S.Ith: https://askubuntu.stackexchange.com/a/1445168 (CC BY-SA 4.0).
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