URL only received mobile organic search traffic
This means that the URL in question only received organic search traffic from mobile devices, per the connected Google Search Console account.
Why is this important?
This should be considered a flag - why did the page receive visits on mobile devices, but not desktop or tablet devices? It could signal an issue with search performance for the page on desktop and tablet devices.
What does the Hint check?
This Hint will trigger for any internal URL which recorded some mobile clicks from organic search (i.e. > 0), but no desktop or tablet clicks.
This data was collected from Google Search Console, via API, for the connected Property, and for the specified date range.
Why is this Hint marked 'Advisory'?
In Sitebulb, this Hint is Advisory, as it does not represent a clear issue. For example, the site you are auditing may be a dedicated mobile site (e.g. m.example.com), so you may actually expect it to only receive mobile traffic. If this is the case, you would simply ignore this Hint.
Similarly, it might simply be the case that there were only a few visits registered during the given time frame, and they just happen to be on mobile.
However, this Hint will also help you pick out instances where the desktop or tablet versions of the page are underperforming, which may actually be indicative of a much wider issue.