Before it appeared at the beginning, but now it does not appear, and I cannot show it manually, I have tried in many ways, but it does not work.
Thanks in advance.
Have you tried uninstalling the game completely, and installing it again?
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You may need to configure the dialog box in Admob itself. You can now manage preferences and custom styling, if it's not configured, it may prevent it from showing.
For some unknown reason, now the ads work. It must have been some google problem.