I received a notification that payment had failed (for my initial subscription).
When I gave my credit card details, my bank requested verification for a debit of €0, which I gave.
Il later Toggl asks for a payment of an annual subscription amount, I would expect the bank to refuse it (as only a zero amount has been authorized). The initial subscription should be requested straightaway.
I can’t find a way to contact Toggl other than to write on this forum.