The news follows an investigation into the crypto exchange by Polish law enforcement officials and reports of customer withdrawal issues. Estonia's Financial Supervision and Resolution Authority (FSA), the country’s financial regulator, issued an investor warning for BB Trade Estonia OÜ, the company that operates the Zondacrypto digital asset exchange. The FSA said the company did not have a white paper listed on its website for the “TeamPL” crypto token listed on the crypto exchange, a violation of the European Union’s Markets in Crypto-Assets (MiCA) regulatory framework. According to the FSA: The investor warning for Zondacrypto and its parent company. Estonia FSA Cointelegraph reached out to Zondacrypto but did not receive a response by the time of publication. The investor warning follows news of withdrawal issues at the Zondacrypto exchange and an investigation into the company by Polish law enforcement officials. Related: Europe’s MiCA regime puts smaller crypto firms under pressure In April, Zonda CEO Przemysław Kral said the exchange did not have access to a cold wallet containing about 4,500 Bitcoin (BTC), valued at about $360 million at the time of writing.