What is probably happening
The campaign is active, but one inventory layer is not eligible
PMax can depend on several serving layers at the same time: campaign status, asset review, listing group eligibility, landing-page access, Merchant Center product approval, account verification and policy history. If one layer blocks meaningful inventory, spend can stay close to zero.
Merchant Center or feed quality is limiting product delivery
For ecommerce, approved is not always enough. Country mismatch, missing shipping, price or availability mismatches, poor identifiers, expired feed data, disapproved variants, weak product titles or excluded listing groups can leave PMax with little usable Shopping demand.
The conversion goal is too weak, too rare or not primary
PMax optimizes around goals. If the selected conversion is secondary, imported late, blocked by consent, duplicated, too rare, attached to the wrong account or weaker than the real business outcome, bidding may not have enough trustworthy signal to scale.
The bid target is stricter than the account reality
A new PMax campaign with a tight tROAS, unrealistic tCPA, small budget, low conversion history or recent strategy changes may be eligible but unwilling to buy auctions. Learning status should be read together with target settings, conversion volume and recent edits.
Asset groups, URLs or audience signals are too narrow
PMax is not a keyword campaign, but it still needs useful creative, landing pages, product groups and audience hints. Weak asset coverage, over-controlled final URLs, tiny remarketing lists, excluded URLs or thin landing pages can reduce the system's ability to find demand.
The account has an upstream trust or policy constraint
Payment issues, advertiser verification, suspicious payment reviews, previous disapprovals, destination problems or site trust issues can suppress delivery before campaign-level optimization becomes relevant.
How to check it without breaking anything
Open campaign diagnostics and read every warning before changing budget or bid strategy.
Check account billing, advertiser verification, policy manager and destination status.
For ecommerce, review Merchant Center product diagnostics by country, destination, availability, price, shipping and identifiers.
Inspect listing groups: excluded products, empty product groups, wrong country, unavailable items and low product coverage.
Check asset group status, asset approvals, final URL expansion, excluded URLs and whether landing pages can support the campaign goal.
Review the selected conversion goals: primary versus secondary, recent firing volume, consent impact, enhanced conversions and import delay.
Compare bid target, daily budget, recent edits and learning status against real conversion history.
Look for any impressions by network or asset/product level. Zero everywhere means eligibility; tiny delivery in one area means constraint or signal quality.
How I would solve it step by step
Prove the campaign has eligible inventory
Start at the top: account, policy, billing, advertiser verification, campaign status and diagnostics. Then go down into assets, URLs and products. Do not optimize a campaign that is still blocked from serving.
Fix the ecommerce feed before touching bidding
If Shopping inventory matters, clean Merchant Center first: product approvals, feed freshness, landing-page match, price and availability consistency, shipping, country, language, GTIN/MPN/brand and listing group exclusions.
Audit the conversion goal that PMax is trying to win
Check whether the primary goal represents real value. If GA4, Google Ads tag, GTM, Consent Mode V2, enhanced conversions or offline imports are unreliable, fix measurement before asking Smart Bidding to make aggressive decisions.
Give PMax enough room, but only where the diagnosis supports it
If eligibility and tracking are clean, loosen one constraint at a time: bid target, final URL controls, product grouping, audience signals, asset coverage or budget. Keep a clean change log so you can identify the real unblocker.
Ramp with business checks, not only platform spend
After delivery starts, compare spend, impressions, product visibility, search terms insights, landing-page behavior, leads, ecommerce orders and margin. A campaign that spends is not automatically fixed if it buys the wrong signal.
If it gets technical
You can follow this path yourself. If the diagnosis reveals a strange data mismatch, a delicate tracking setup, a risky bidding decision or a blocker that needs account access, Lia keeps this context and brings it to CreatikLab so you do not start from zero.
Take this context to LiaWhat I would not do
Raising budget while Merchant Center products are limited or excluded.
Removing all final URL controls and product exclusions at once.
Blaming learning status without checking conversion-goal quality.
Optimizing PMax on a low-value microconversion just to make it spend.
Ignoring feed titles, identifiers, shipping and price mismatches because products show as approved.
Comparing PMax to Search delivery without accounting for assets, feed, goals and inventory breadth.
Frequently asked questions
Is it normal for a new Performance Max campaign not to spend at first?
A short ramp-up can be normal, especially after review or major edits. But if spend and impressions stay near zero, diagnose eligibility, feed, assets, bid target, conversion goals and account constraints instead of just waiting.
Should I remove the tROAS or tCPA target?
Only after checking eligibility and measurement. A strict target can block delivery, but removing it blindly can also make PMax buy weak traffic. Use a controlled test and keep a change log.
Can Merchant Center stop PMax from spending?
Yes. Product disapprovals, limited products, country or destination mismatches, shipping issues, price mismatches, expired feed data or excluded listing groups can all reduce Shopping inventory and limit PMax delivery.
What if PMax spends only on YouTube or Display but not Shopping?
That is a different problem from no spend. It usually requires checking product eligibility, listing groups, feed quality, asset mix, final URL expansion, conversion value and whether the campaign has enough high-intent product demand.
