Unity IAP not initialized

Hello, we are having trouble initializing Unity IAP. It seems to fail at "getSkuDetails() failed: 2:Unknown" and the IStoreListener.OnInitiliazed(...) is not getting called . I've checked that SKU is correct, app is in Internal testing in Google Play Console, package name, version, build number... I have my google acc listed in testers.
Does someone know what "(response: 2:Unknown)" means ?

The issue appears on Android, works on iOS
Unity 2019.4.5f1
Unity IAP 2.0.6

Here is logcat:
11-23 16:43:10.817: I/UnityIAP(25208): IAB helper created.
11-23 16:43:11.678: I/UnityIAP(25208): Starting in-app billing setup.
11-23 16:43:11.681: I/UnityIAP(25208): Billing service connected.
11-23 16:43:11.681: I/UnityIAP(25208): invoking callback
11-23 16:43:11.682: I/UnityIAP(25208): Checking for in-app billing 3 support.
11-23 16:43:11.684: I/UnityIAP(25208): In-app billing version 3 supported for com.xxx
11-23 16:43:11.686: I/UnityIAP(25208): Subscriptions AVAILABLE.
11-23 16:43:11.688: I/UnityIAP(25208): Subscription upgrade and downgrade are AVAILABLE.
11-23 16:43:11.690: I/UnityIAP(25208): Subscriptions information parse AVAILABLE.
11-23 16:43:11.703: I/UnityIAP(25208): VR supported.
11-23 16:43:11.704: I/UnityIAP(25208): onIabSetupFinished: 0
11-23 16:43:11.704: I/UnityIAP(25208): Requesting 3 products
11-23 16:43:11.704: I/UnityIAP(25208): QueryInventory: 3
11-23 16:43:11.704: I/UnityIAP(25208): invoking callback
11-23 16:43:11.704: I/UnityIAP(25208): Querying owned items, item type: inapp
11-23 16:43:11.704: I/UnityIAP(25208): Package name: com.xxx
11-23 16:43:11.704: I/UnityIAP(25208): Calling getPurchases with continuation token: null
11-23 16:43:11.706: I/UnityIAP(25208): Owned items response: 0
11-23 16:43:11.707: I/UnityIAP(25208): Continuation token: null
11-23 16:43:11.707: I/UnityIAP(25208): Querying SKU details.
11-23 16:43:11.893: I/UnityIAP(25208): getSkuDetails() failed: 2:Unknown
11-23 16:43:11.894: I/UnityIAP(25208): onQueryInventoryFinished: false
11-23 16:43:11.894: I/UnityIAP(25208): Error refreshing inventory (querying prices of items). (response: 2:Unknown)
11-23 16:43:11.894: I/UnityIAP(25208): Failed to Query inventory. UnityIAP will automatically retry in 5000ms

 

Yes, that helped, thank you !