Are permitted allies only from the list or any available in the period 501-600 AD?
Also (probably already clarified somewhere) II/69c Sassanid Persian lists II/80 as Allies - is this both II/80b&d Sabir & Other Huns?
The list is the list of "allowed armies (and permitted allies)".
We had to try and decide which Hun sublist(s) were intended as allies of the Sassanids in order to decide which to allow as permitted armies, so in this case, either b or d options can be used as the Sassanid ally.
Looks like Yemeni’s II/23c have Sassanids as enemies, but not vice versa.
Unfortunately, I won't see Lindon for another month to discuss changes, by which time it would really be too late to make the change. A pity, as I would have liked the opportunity to include the City Arabs.