Hello,
This is a known issue reported at GitHub. Please see iOS AppDelegate - PerformFetch override #1419 and iOS AppDelegate - Override for PerformFetch is not available #7957
And it was fixed the in .Net8.0.0-preview.3.8149.
For the usage of App lifecycle, you could refer to App lifecycle - .NET MAUI | Microsoft Learn.
Best Regards,
Wenyan Zhang
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