When making payments from a EUR account, the payment will often be held as validated, which is essentially a pending state either from the network or from us when a compliance check is required.
Payments via the SEPA network are processed and cleared at certain times of the day, rather than immediately like UK Faster Payments. So even though your payment has been successful, the funds are yet to clear your account.
Payments can also be in a validated state when a check or hold is on funds for compliance reasons. We'll be in touch with you when we begin the checks, but you can also contact support if your funds have not cleared your account within 24 hours.