It seems utterly unreasonable to not allow charging of a mobility scooter. The most generous thing I can think of is that the EC is busy researching and discussing about how to manage the introduction of electric vehicle charging and has not yet come to a conclusion so they don’t want to make a commitment now.
However, the solution for this, whether for a mobility scooter or any other sort of electric vehicle, where there are probably only one or a few people interested at this time, is to give temporary permission with conditions. One of the conditions would be that the permission can be rescinded at any time such as when it is no longer appropriate because some more permanent solution for vehicle charging has been arrived at.
A mobility scooter would take up very little room and little electricity while charging. I would suggest that a reasonable estimate of the amount of electricity needed could be used to arrive at some amount to be paid as reimbursement to the Owners Corporation. It is bound to be a trivially small amount (a few 10s of dollars a year, I’d guess) but it might shut up the mean-spirited types who worry about people getting something for nothing.
The amount taken by an electric car, on the other hand, would not be trivial and might amount to some hundreds of dollars-worth per year [eg. (say) 10,000km/year x (say) 15kWh/100km x (say) 25c/kWh = $375]. Even so, a reasonable estimate could be made and even rounded up to make sure the OC is not out of pocket for a short-term, ad hoc solution while it works out how it is going to roll out charging when there are more than just a few wanting to use a power point.