[WARNING] [KivMob ] Ads will not be shown.

[Mglt-b]

Hello

Search help with KivMob, i'm new on this tool

Have this warning when run my python script :
(and no ad show up (android or windows python test)

[WARNING] [KivMob ] Ads will not be shown.

python code :

#import kivmob for ads
from kivmob import KivMob, TestIds

...

class GooFiberApp(App):

    def build(self):
        sm = ScreenManager()


        if valid_app == 1:

            sm.add_widget(MenuScreen(name='menu'))
            sm.add_widget(SettingsScreen(name='settings'))
            sm.add_widget(ColorScreen(name='colorfi'))
            sm.add_widget(ArcepEli(name='arcep_eli'))
            sm.add_widget(BilanOptique(name='bilan_optique'))
            sm.add_widget(Seuils(name='seuils'))
            sm.add_widget(LexiqueScreen(name='lexique_fibre'))


        if valid_app == 0:

            sm.add_widget(Error_vers(name='error_vers'))



        #ads
        self.ads = KivMob(TestIds.APP)
        self.ads.new_interstitial(TestIds.INTERSTITIAL)
        self.ads.request_interstitial()
        self.ads.show_interstitial()
        #####""


        return sm

buildozer.spec :

# (list) Permissions
# (See https://python-for-android.readthedocs.io/en/latest/buildoptions/#build-options-1 for all the supported syntaxes and properties)
android.permissions = android.permission.INTERNET, (name=android.permission.WRITE_EXTERNAL_STORAGE;maxSdkVersion=18), ACCESS_NETWORK_STATE

....

# (int) Target Android API, should be as high as possible.
android.api = 33

# (int) Minimum API your APK / AAB will support.
android.minapi = 21

# (int) Android SDK version to use
android.sdk = 33

# (str) Android NDK version to use
android.ndk = 25b

....

# (list) Gradle dependencies to add
android.gradle_dependencies = com.google.firebase:firebase-ads:21.4.0

....

# (list) Android application meta-data to set (key=value format)
# For test ads, use application ID ca-app-pub-3940256099942544~3347511713
android.meta_data = com.google.android.gms.ads.APPLICATION_ID=ca-app-pub-3940256099942544~3347511713

thanks for help