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Google Ads Offline conversion attribution Error

UPDATE Dec. 8, 19:15 CET - Google has confirmed there is an issue and is working on solving the problem.

 Additional details:

December 8, 2025 Starting around December 5–6, Google Ads began under-attributing offline conversions imported via API. Although Google confirms that all conversions are received successfully, attribution within Google Ads is currently 50–60% lower than normal.

This issue affects many advertisers and tools that rely on offline conversion imports—not just ProfitMetrics. We have contacted Google Ads API Support and will update customers as soon as Google resolves the issue or attribution returns to normal.

What Is Happening?

  • Offline conversions imported into Google Ads are not being fully attributed.

  • Google Ads reports successful receipt of all conversions via API.

  • Despite this, attributed conversion counts are only at 50–60% of normal levels.

  • The issue appears to have started gradually around December 5–6.

  • The problem is not caused by ProfitMetrics; advertisers importing conversions manually and other tools are also affected.

Who Is Affected?

1. Customers Using Full Conversion Booster Setup

This includes:

  • PM Gross Profit – Browser (browser-based; not impacted)

  • PM Gross Profit – Conversion Booster (offline import)

  • PM Revenue – Browser (browser-based; not impacted)

  • PM Revenue – Conversion Booster (offline import)

Impact:

Minimal.

Browser-based conversions (your primary conversion source) are still fully attributed. Only the additional offline conversions from the Conversion Booster show reduced attribution—typically 5–20% of total conversions—so the practical effect is small.

2. Customers Relying Only on Conversion Booster Offline Imports

If you use:

  • PM Revenue – Conversion Booster only

    or

  • PM Gross Profit – Conversion Booster only

    (and do not use browser-based conversion actions)

Impact:

High.

You may see 50–60% fewer conversions reported in Google Ads.

This can artificially lower conversion value and may cause automated bidding to reduce traffic.

Recommendation:

Monitor:

  • Traffic levels

  • Budget pacing

  • Target ROAS bids

Ensure campaigns do not unintentionally scale down due to under-reported value.

What You Should Do

At this time, no action is required on your side. We recommend:

  • If using browser-based conversions: continue as usual; the effect is minimal.

  • If relying only on offline imports, keep a closer watch on campaign performance until attribution normalizes.

What ProfitMetrics Is Doing

  • We have escalated the issue to Google Ads API Support.

  • We will provide updates as soon as:

    • Google responds with clarification, or

    • We observe that attribution returns to normal levels.

We sincerely apologize for any disruption this may cause and are here to assist with any questions.