FYI to custom kernel users who are suddenly failing device attestation in Play Integrity
The cause appears to be that Google has blacklisted certain strings from kernel version names (case insensitively).
The reason my kernel fails Play Integrity device attestation right now is because Google blacklisted my name from the kernel version string:5.15.110-Sultan
fails5.15.110-sultan
fails5.15.110-Slutan
works
Other kernels which are affected by the Play Integrity change are likely also on Google's kernel version string blacklist.
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