Symptoms
Customer cannot place order in the Online Store, error message is shown:
Account is blocked. Order can not be placed. Please contact service provider.
However, customer account is active, corresponding user is active, too.
Putting account on hold and releasing it from hold does not help to solve the problem.
Cause
The possible reason is the Online Store cache. The customer tried to place order when their account was on hold, Online Store stored this information in cache.
Later, customer account was activated and customer tried to place order in the Online Store, however according to information in the Online Store cache customer account is still on hold.
Therefore, the Online Store does not allow customer to place order.
Resolution
Clear Online Store cache manually here:
BA PCP (or RCP of corresponding reseller) > Products > Online Store > Synchronize now
As a result Online Store cache will be cleared.