I tried the Velobet no deposit bonus last week and got the same error message. After contacting their customer support through live chat, they told me it was because I had already claimed a previous promotion. Apparently, their system flags accounts that have used other bonuses recently. Try clearing your cookies or using a different browser – that worked for me eventually. If that doesn’t help, definitely reach out to their support team at [email protected] They responded within a day for me.