If you live / stay in one country (say France - Euro) and then move to another country (say UK - sterling) ; and you have a subscription, and you want to change the subscription currency from Euro to the local one (in this case sterling) , you can’t. This is a bit annoying.
apparently you have to cancel your existing subscription and the (I think) start a new subscription in a different currency. Strava says the data that you have access to from your subscription won’t be lost ….. I haven’t tried it yet.