Someone called to say that your online trademark has been applied. I think it may be that the name of your online store or product brand has been applied.
Or the trademark you applied for online, because the trademark application comes first, you applied before you applied, and your re-application will be rejected.
Trademark registration can be used online or offline. Now, opening online stores on e-commerce platforms such as Amazon, JD.COM and Tmall requires trademarks. You can develop brands online and form a certain popularity.