You open a report, see conversions credited to a channel, and assume you have your answer. In reality, enquiry journeys are often spread across multiple visits, multiple channels, and multiple devices before somebody finally fills in a form or picks up the phone. Google’s own guidance makes clear that GA4 attribution depends on the model and settings being used, so the number you see is not always the full story.
That matters in the UK because digital behaviour now plays a major role in how people research services before they enquire. The Office for National Statistics reported that online spending accounted for 50.5% of total card spending in September 2025, up from 43.7% in September 2019. When so much customer activity happens online, attribution mistakes can lead to real budget mistakes, especially when you are deciding where to put the next £5,000 or £10,000 of marketing spend.
Why GA4 attribution can trip you up
The first problem is assuming attribution is the same as truth. It is not. Attribution is a method for assigning credit to touchpoints before a key event happens. In GA4, that credit changes depending on the attribution model you choose and the lookback window you apply. Google also states that direct visits are excluded from receiving attribution credit unless the path to the key event consists entirely of direct visits. That means the story in your reports is shaped by rules, not just by raw behaviour.
For enquiry-driven businesses, that can become a real problem because lead journeys are rarely tidy. Someone might first discover you through SEO / Organic Marketing, return through Paid Advertising, visit again via a branded search, and only convert after going direct. If you only look at the final report line, you may end up rewarding the closing channel and undervaluing the channels that created the demand in the first place.
Pitfall 1: Treating one attribution model as the final answer
GA4 offers multiple attribution models in its reporting, including data-driven attribution, paid and organic last click, and Google paid channels last click. Each model applies credit differently. So if you look at one model in isolation and treat it as fact, you can make the wrong call on where your best leads are really coming from.
This is where many enquiry-led businesses go wrong. Paid search might look like the strongest performer because it appears near the end of the journey. But that does not always mean it created the opportunity. Sometimes your earlier content, brand visibility, or technical improvements did the heavy lifting. Looking across channels with support from Data & Analytics Agency thinking and a stronger Insight & Strategy approach gives you a much better read on what is actually moving people towards an enquiry.
Pitfall 2: Confusing acquisition reports with attribution reports
Another common mistake is mixing up traffic acquisition with attribution. GA4 uses different scopes for different traffic-source dimensions. Session attribution still uses a non-direct last click approach, while key event attribution can be shaped by the property’s attribution settings. So the report showing where a session came from is not automatically the report that explains how conversion credit should be shared across the journey.
In simple terms, one report tells you where the visit started. Another tells you how GA4 has assigned credit to the key event. Those are different questions. If you compare them without understanding the difference, you can end up making decisions on mismatched data. That is why businesses often benefit from cleaner measurement foundations, whether that means better Tag Manager setup, stronger tracking governance, or a more focused SEO Performance Agency reporting structure.
Pitfall 3: Counting the wrong actions as success
GA4 now uses the term key events instead of conversions inside Analytics reporting. A key event is simply an action you have marked as especially important. Google also notes that engaged sessions can include sessions with a key event, sessions longer than 10 seconds, or sessions with 2 or more page or screen views. That means GA4 can surface plenty of useful behavioural signals, but not all of them should be treated as meaningful commercial success.
For an enquiry-driven business, a generic button click or a lightweight engagement event should not usually sit in the same bucket as a qualified contact form submission or a booked consultation. If you mark too many low-intent actions as key events, your attribution picture gets noisy very quickly. A more useful setup is to focus on the actions that reflect real commercial value, then use everything else as supporting context. That is also why work such as a GA4 + Search Console SEO Audit tends to be far more useful than simply installing GA4 and assuming the defaults are enough.
Pitfall 4: Ignoring channel grouping and tagging issues
Attribution is only as good as the source data feeding it. Google says default channel groups in GA4 cannot be edited, although you can create custom channel groups. It also explains that incomplete or incorrect UTM parameters can lead to “(not set)” appearing in reports. So if your campaign tagging is messy, your attribution outputs will be messy too.
This matters even more for enquiry-led businesses because lower lead volumes make every reporting error feel bigger. If a small number of enquiries fall into the wrong channel or show up as unassigned, your monthly performance view can shift enough to affect budget decisions. That is where stronger Technical SEO Agency, better campaign discipline, and more reliable Website Design & Development support can make the data far more dependable.
Pitfall 5: Forgetting the role of time and missing data
Lead generation rarely happens in a single session. Google states that users can trigger key events days or weeks after interacting with an ad, and that the key event lookback window determines how far back a touchpoint is eligible for attribution credit. If your sales cycle is longer than your settings allow for, some earlier touchpoints may not get the credit you expect. (Google Help)
On top of that, consent choices, browser restrictions, broken tags, and inconsistent setup can all create gaps. So when a channel seems weak, the answer is not always that it underperformed. Sometimes the measurement is incomplete. This is why enquiry-led reporting often works best when you combine GA4 with lead-quality feedback, CRM outcomes, and practical dashboards like the thinking behind dashboards stakeholders actually use.
What you should do instead
Start by deciding what a real enquiry means for your business. Then make sure that is what you are measuring. Review your attribution model, your lookback window, your key events, and your UTM discipline. Compare acquisition reporting with attribution reporting carefully rather than assuming they are interchangeable. Most importantly, ask not just which channel got the credit, but which channel helped create the lead in the first place.
That wider view is usually where better decisions come from. When you connect performance data with real commercial outcomes, you stop chasing the neatest-looking report and start building something far more useful. If you want a clearer measurement setup for your enquiry journey, explore Totally Digital’s services, browse the latest insights, learn more about us, or get in touch to build reporting that reflects how your leads actually happen.