The security alert is triggered by the fact that the new Twitter domain, ‘x.com’, is not listed in Microsoft Edge’s list of trusted websites. This means that the browser is unable to verify the authenticity of the site, and it could potentially be a phishing attempt.
Microsoft has advised users :
Microsoft has advised users to be vigilant when visiting the new Twitter site, and to only do so if they are sure that it is the legitimate site. Users should also be careful about entering any personal information on the site, as it could be stolen by scammers.
Amid its rapid rebranding over the last few days, Twitter (or X) has also ditched the famed bird icon for a Unicode character which resembles the letter X but infact bears Mathematical meaning.

Complications have arisen for X during its rebranding process, as other companies, including Meta and Microsoft, already possess trademarks on variations of the letter ‘X.’ This could potentially lead to lawsuits for Musk’s company. Additionally, when attempting to change signage at its San Francisco headquarters, X encountered issues as it lacked the required permits. Consequently, the company had to abandon its facelift plans, keeping the old bird logo and the letters “er” intact for a brief period.
Moreover, we can expect more issues to appear in the coming weeks. Recently, Indonesia banned X temporarily because the X.com domain (which now redirects to Twitter) was blocked due to the country’s laws on online gambling and pornography.
According to Google searches :
According to Google searches, other users have also been confused by Edge flagging X as dangerous. Some feared their devices were infected with malware. While experienced tech users understand it’s a false positive, it still shows doubts among many customers.
Microsoft Edge warns this is a potential security issue—and it’s working as intended. It’s got to do with a security feature dubbed ‘Progressive Web App Icon change’, designed to alert users of app icon or name changes, possibly indicating a scam.

Here are some tips for staying safe when visiting the new Twitter site:
Be careful about entering any personal information on the site. This includes your username, password, and credit card information.
Use a secure internet connection. This means using a Wi-Fi network that is password-protected.
Keep your web browser up to date. This will help to ensure that your browser has the latest security patches.