The mgs thing is weird then, they gave perm to nijien, nijijp, hololivejp but specifically excludes holoen?
But either case happened here:
1. NijiEN accept blanket perms like stardew valley and lethal company's and no email was required. (Most likely)
2. The furry happened to open up his email when niji asked but hadnt when holo asked.
3. The furry is anti-holo (very unlikely)
Bet the talents would be playing the moment perms are available. Heck they probs are playing it off stream or doing not tempus
If you dont have one maybe they accept handwritten letters carried by mail.