Some discrepancy is normal and expected. Common causes:
Install count gap: Every ad network claims every install it had any role in. The MMP assigns each install to exactly one source. This gap is by design — the MMP number is correct.
Spend discrepancy: Minor differences can occur due to timezone differences in daily data cutoffs. Ensure both use the same date range and timezone before investigating.
Attribution window settings: Different attribution windows (7-day click, 1-day view, etc.) affect which installs the MMP assigns to which network. Verify your MMP attribution windows match your agreed settings with each ad network.
iOS ATT (App Tracking Transparency): On iOS 14.5+, deterministic attribution is limited. Some installs are attributed probabilistically, which can cause additional discrepancies.
Note: If the discrepancy is unexpectedly large and persists across multiple days for a specific network, contact Segwise support with the network name, date range, and both figures (MMP vs. network reported).